Most places don't test for steroids. They're concerned if you're using things like amphetamines, heroin, etc.
Having a juicer on the force is one thing, having a crackhead is different.
And like Velvet said, look into the suppliments before you dive into steroids.
Fish oil and glucosamine help my powerlifting joints even when they ACHE.
That being said, I believe Deca is well known for its joint aiding properties, but it also has something like an 18 month period in which it's detectible.