She also appeared to be under the influence of drugs.

I thought driving under the influence of drugs was already against the law.

But the influence of drugs continues to hum, even though he says he's given them up.

Ryan knew somehow that he was under the influence of drugs.

Do not exercise if you are under the influence of drugs or alcohol.

Driving under the influence of drugs or alcohol is wrong.

Never drive when you are under the influence of drugs or alcohol.

It is not known whether he was under the influence of drugs or alcohol.

I want to know whether or not he is under the influence of drugs.