Your roommate is involved, he lives there, thats the way the po po's will look at it. He will be the prime target that the cops go after to snitch. If only one person knows thats one person too many. It gets worse from there with every person that knows. Its the smuglers blues. Manufacturing marijuana is a federal offense and carries mandatory time. I think that its soft time now, but I might be wrong, that is having to do 50% of the time,then released to a halfway/rehab house. Dont let that scare you. Its amazing when at the end of say, five calenders, you get released, and you look back and it seems to have gone by fast. Do it, just bag the roommate.