If a male received unprotected oral sex from a female drug user, would the drugs used by the female show up in a random drug test taken by the male. The drugs in question are crack, heroin and pot.

No. Why would you think that a drug test would show positive to a person not DOING drugs?

I thought maybe the drugs could be transferred from one person to another

No, silly, they can't. LOL

There is no way that drugs can be transmitted via sex. It's just not possible. It's not like transmitting STDs, it just doesn't happen.