You can't judge drug use based on appearance.
It may sound strange to you, but the fact is most athletes that use stuff will never show a bodybuilder type physique...at least not a good one.
Most guys will maintain their weight and get stronger. In the end it helps with recovery more than anything else, they simply do not eat enough and train enough to gain muscle and it is NOT thier objective.
Look at laundis ( bike rider, Palmero (baseball, olympic athletes, etc).
Many people 165 take more stuff then you would imagine.