A worker performs a test to prove that it is a controlled substance before mixing with cement and industrial waste to build a construction, at a waste treatment plant, at an undisclosed location, in Ecuador February 10, 2023. REUTERS/Karen Toro 

Dave Hamm, an ethical substance peer navigator with the Vancouver Area Network of Drug Users (VANDU), distributes packets of drugs tested for contaminants, as the province of British Columbia decriminalized the possession of small amounts of cocaine, methamphetamine, MDMA and opioids like heroin, fentanyl and morphine, in the Downtown Eastside of Vancouver, British Columbia, Canada January 31, 2023. REUTERS/Jennifer Gauthier 

Dave Hamm, an ethical substance peer navigator with the Vancouver Area Network of Drug Users (VANDU), distributes packets of drugs tested for contaminants, as the province of British Columbia decriminalized the possession of small amounts of cocaine, methamphetamine, MDMA and opioids like heroin, fentanyl and morphine, in Downtown Eastside of Vancouver, British Columbia, Canada January 31, 2023. REUTERS/Jennifer Gauthier 

Dave Hamm, an ethical substance peer navigator with the Vancouver Area Network of Drug Users (VANDU), distributes packets of drugs tested for contaminants, as the province of British Columbia decriminalized the possession of small amounts of cocaine, methamphetamine, MDMA and opioids like heroin, fentanyl and morphine, in the Downtown Eastside of Vancouver, British Columbia, Canada January 31, 2023. REUTERS/Jennifer Gauthier 

Dave Hamm, an ethical substance peer navigator with the Vancouver Area Network of Drug Users (VANDU), weighs a piece of rock cocaine as the province of British Columbia decriminalized the possession of small amounts of cocaine, methamphetamine, MDMA and opioids like heroin, fentanyl and morphine, in the Downtown Eastside of Vancouver, British Columbia, Canada January 31, 2023. REUTERS/Jennifer Gauthier 

Dave Hamm, an ethical substance peer navigator with the Vancouver Area Network of Drug Users (VANDU), weighs a piece of rock cocaine as the province of British Columbia decriminalized the possession of small amounts of cocaine, methamphetamine, MDMA and opioids like heroin, fentanyl and morphine, in the Downtown Eastside of Vancouver, British Columbia, Canada January 31, 2023. REUTERS/Jennifer Gauthier 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, exits a car, on the day of a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, gestures on the day of a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, attends a news conference, announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, speaks during a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, attends a news conference, announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, speaks during a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, attends a news conference, announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, speaks during a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, speaks during a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Colombian cyclist Nairo Quintana, winner of Vuelta a Espana and Giro D'Italia, speaks during a news conference announcing he is currently looking for a team, after being disqualified from the 2022 Tour de France due to use of a banned substance, in Bogota, Colombia January 25, 2023. REUTERS/Luisa Gonzalez 

Patrick Janssen, co-founder of the organisation Dung Dung, and Thomas Petry, producer, make a tile from recycled human hair that is used to absorb polluting chemical substances in water, in Waremme, Belgium December 8, 2022. REUTERS/Yves Herman 

Patrick Janssen, co-founder of the organisation Dung Dung, shows a tile made from recycled human hair that is used to absorb polluting chemical substances in water, in Waremme, Belgium December 8, 2022. REUTERS/Yves Herman 

Patrick Janssen, co-founder of the organisation Dung Dung, and Thomas Petry, producer, make a tile from recycled human hair that is used to absorb polluting chemical substances in water, in Waremme, Belgium December 8, 2022. REUTERS/Yves Herman 

Patrick Janssen, co-founder of the organisation Dung Dung, shows a tile made from recycled human hair that is used to absorb polluting chemical substances in water, in Waremme, Belgium December 8, 2022. REUTERS/Yves Herman 

Thomas Petry, producer at the organisation Dung Dung, prepares human hair to make a tile from recycled hair that will be used to absorb polluting chemical substances in water, in Waremme, Belgium December 8, 2022. REUTERS/Yves Herman 

Thomas Petry, producer at the organisation Dung Dung, prepares human hair to make a tile from recycled hair that will be used to absorb polluting chemical substances in water, in Waremme, Belgium December 8, 2022. REUTERS/Yves Herman 

A bag containing human hair is seen at hair salon Helyode before being collected by the association Dung Dung, that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Bags containing human hair are seen at hair salon Helyode before being collected by the association Dung Dung, that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Bags containing human hair are seen at hair salon Helyode before being collected by the association Dung Dung, that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Belgian hairdresser at hair salon L'Atelier Chedly Boussigua cuts a customer's hair, which will be collected by the association Dung Dung that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Belgian hairdresser at hair salon L'Atelier Chedly Boussigua cuts a customer's hair, which will be collected by the association Dung Dung that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Isabelle Voulkidis, manager of hair salon Helyode, cuts a customer's hair, which will be collected by the organisation Dung Dung that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Belgian hairdresser at hair salon L'Atelier Chedly Boussigua cuts a customer's hair, which will be collected by the association Dung Dung that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Belgian hairdresser at hair salon L'Atelier Chedly Boussigua cuts a customer's hair, which will be collected by the association Dung Dung that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

Human hair are seen at hair salon Helyode before being collected by the association Dung Dung, that transforms hair into tiles used to absorb polluting chemical substances in water, in Brussels, Belgium November 4, 2022. REUTERS/Yves Herman 

An ATM machine is covered with a liquid substance outside a Blom Bank branch in Beirut, Lebanon September 14, 2022. REUTERS/Emilie Madi 

At least 299 Olympic athletes have tested positive for banned substances since doping tests were first conducted at the 1968 Summer Olympics. 

A boy rides a horse past a street blocked by residents of the low-income neighbourhood "Puerta 8", to protest the detention of people by the police, where according to authorities people bought cocaine suspected of containing a poisonous substance, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian TPX IMAGES OF THE DAY 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities some people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian TPX IMAGES OF THE DAY 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

A woman walks past a street blocked by residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Police officers stand guard as residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, work building a house, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

A boy rides a horse past a street blocked by residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

People walk past a street blocked by residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Lucia Galloso, resident of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, reacts during a street block to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

A resident of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, walks through an alley, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, chat in an alley, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

Residents of the low-income neighbourhood "Puerta 8", where according to authorities people bought cocaine suspected of containing a poisonous substance, block a street and set tires on fire to protest the detention of people by the police, in Buenos Aires, Argentina February 4, 2022. REUTERS/Agustin Marcarian 

A general view of the low-income neighbourhood "Puerta 8" where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 3, 2022. Picture taken with a drone. REUTERS/Miguel Lo Bianco 

A resident walks at the low-income neighbourhood "Puerta 8", where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina, February 3, 2022. REUTERS/Agustin Marcarian 

Residents chat in the low-income neighbourhood "Puerta 8", where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 3, 2022. REUTERS/Agustin Marcarian 

A cradle is pictured inside an alleged cocaine kitchen, at the low-income neighbourhood "Puerta 8" where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 3, 2022. REUTERS/Agustin Marcarian 

A resident is seen in the low-income neighbourhood "Puerta 8", where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 3, 2022. REUTERS/Agustin Marcarian 

A resident is seen in the low-income neighbourhood "Puerta 8", where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 3, 2022. REUTERS/Agustin Marcarian 

The facade of an alleged cocaine kitchen, at the low-income neighbourhood "Puerta 8", where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina, February 3, 2022. REUTERS/Agustin Marcarian 

Residents are seen in the low-income neighbourhood "Puerta 8", where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina, February 3, 2022. REUTERS/Agustin Marcarian 

Residents are seen in the low-income neighbourhood "Puerta 8" where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 2, 2022. REUTERS/Matias Baglietto 

Residents are seen in the low-income neighbourhood "Puerta 8" where according to local media people bought cocaine suspected of containing a poisonous substance, on the outskirts of Buenos Aires, Argentina February 2, 2022. REUTERS/Matias Baglietto