Red meat and eggs have become illicit substances for many people.

Rediscovered in the sixties, it was not an illicit substance, and so came to be used quite widely.

Guns, knives and illicit substances (like marijuana) are turned over to the police.

About half the respondents said they had indulged in illicit substances.

Young athletes say they are influenced by their professional role models who use illicit substances.

It is also rumored that almost any illicit substance can be had there for a price.

No illicit substances have ever been found in these searches.

This means the athlete is responsible for any illicit substance in his or her body, no matter how it got there.

It then proceeds to more specific questions about illicit substances.

It is easier than before to smuggle illicit substances across borders.