What's the name of the American alien immigration movie?

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.

Aliens also take drugs. It's a blue liquid. Drinking too much makes you invulnerable, and finally the villain drinks it.

This film is very old. Try to search the electric donkey, there is no way out without it.