Illegal drugs are known to have harmful effects on the human body. People who use drugs can become addicted to them. They cannot stop taking medication, otherwise some symptoms will appear and make them uncomfortable. If they continue taking medication instead of giving up, their body's immunities may be destroyed, making it easier for people to get sick or even die. Not only harms health, but drug addiction can also lead to certain crimes, which have a terrible influence on families, communities or countries. Each country has its own drug policy, and the differences between them can be defined as strict and liberal. Liberal policy can be defined as having fewer controls or light penalties against the sale and use of illegal drugs, while a strict policy can be defined as the opposite. I chose two typical countries: Mexico which has a liberal policy with no death penalty, and Thailand which has a stricter policy with death penalties and long-term prison sentences. In this report, I focus on the effects of drug policies in these countries. Liberal policy cannot control the trade and use of illegal drugs well because the penalties are too light, while strict policy cannot always have a positive impact on illegal drugs due to internal reasons such as corruption. This is why the Mexican and Thai governments have no effect on the trade and use of illicit drugs. Mexican drug policy sets a standard for the maximum amount for trafficking each type of illegal drug. You will receive a penalty if you sell or buy illegal drugs above the maximum amount. For example, the maximum amount of heroin trade is 50 mg. If you break the law and sell more than 50 mg of heroin, the police will put you in jail. How long you stay in prison depends on how much you trade beyond the maximum number, and... middle of paper... sell the illegal drugs. “Drug syndicates have around $35 billion to $60 billion in revenue per year. Such a large sum gives them enormous capacity to corrupt those charged with opposing them” (Ted Galen Carpenter, 2012, paragraph 12). In conclusion, Thailand has a much stricter drug policy than Mexico due to long prison sentences and the existence of the death penalty. In these countries, due to light sanctions or corruption, governments cannot control illegal drugs well. For Mexico, strict laws with harsh penalties for drugs and corruption should be put in place and put into practice in order to resolve this disorderly situation. It is also important for the Thai government to combat drug trafficking organizations and address corruption issues. In a word, these governments have no effect on the exchange and use of illicit drugs..