get it out
It is better to be paranoid and inconvenienced than ass raped.
Also be careful what you have stored on your computer. They will search that too. But if it is just local cops, they will probably not do more than a simple search of your files. Delete your cache and bookmarks related to drugs and clear that history file too. Then defrag the hard drive. For dumbass local cops that should be enough, but you can go farther than that with the right programs. Just look for a DOD file shredder. And use it. DOD stands for department of defense. Use it on any files relating to your steroid use, then uninstall it. And delete what references you can to the file shredder.
One thing you can do if you want to be an ass, because they will look at them is to get a bunch of scat or gay porn pictures. I mean just download shitloads of them, they will search them. That and fat chick porn. ANd the sick japanese stuff that ain't illegal, but is gross as fuck. Like vommit eating. Movies of that stuff too. get all these after you do the above delete/defrag/shred stuff. It'll help muddle up your hard drive. Plus them bastards will get sick(or probably turned on).