June 26 is the International Day against Drug Abuse and Illicit Trafficking designated by the United Nations to call attention to the issue of drug control, raise people's awareness of the harm of drugs, and call on the whole society to participate in anti-drug work.

Based on the characteristics of drug detection in different biological materials such as blood, urine, hair, saliva and nails, different methods can be applied at different stages in drug prevention and control and fight in the future, and different detection methods can be selected for different groups of people.

In 2021, one in 17 people aged 15-64 globally will have used a drug in the previous 12 months. The increase in the estimated number of users from 240 million in 2011 to 296 million in 2021 (5.8 per cent of the global population aged 15-64) shows that the drug problem can be global and its scale is growing.