No it's illegal and if you enter it professionally you have to be tested and if your found to have been taking them you will be disqualified.
yes all body builders use Steroids they can not become as strong Like simple practice they have to take it.
There is a good chance that they are. There is a hard chance to have their bodies sculpted the way they have right now.
I would say most of them are taking or have taken steroids. Of course, you have the natural bodybuilding guys who prefer not to go down that road. I don't think it is that big a deal anymore. All athletes take sports nutrition products these days and steroids are just a hardcore option.