Ask for an old American horror film, in which a man committed suicide by taking poison when he was desperate, and then his body turned into a corpse, but he couldn't kill himself by shooting.

Looks like an alien movie. This man is actually an alien. The tube is full of alien drugs. Eating a little will make aliens excited, but eating too much will make them vicious and invulnerable.

That man was a drug dealer, and finally he was cornered and took drugs.

Is that so?

Alien Empire (1988)

The story is set in the future world of Los Angeles. At this time, 300,000 migrant workers have entered the United States and become one with the people of the earth. In order to find out the real murderer, Essex, the partner of Interpol, had to accept Francis, an alien policeman, as his new partner. In the process of tracing the truth, two different kinds of criminal police gradually eliminated their mutual distrust, and overcame the obstacles encountered in investigating cases of different races, and jointly dealt with the main suspect-Terrence Stamp, a malicious earth entrepreneur.