Why are you assuming that your roommate did it? Landlords have been convicted of doing that to tenants, even watching women in the bathrooms, showering, and the bedrooms. There are several approaches you can take. 1) Report it to the police, show them, take photos of the cameras and then rip them out; 2) Rip out all of the cameras and if your roommate mentions it, tell him - "can you believe that the landlord would do such a thing?". "I went to him and yelled at him about it and told him I was going to sue him." Your roommate will think he is off the hook or he might try and convince you not to sue. He might even admit to doing it. Tell him you were so angry that you threw out the cameras. 3) How you want to handle it is up to you. You could also consult a lawyer. Look into evicting him.
Certified Paralegal, with 25+ years' experience & with Landlord & Tenant law experience.