Zambi, you need to look up lynch all liars. If a cop claims VT day 1, he will likely get lynched later on when he attempts to claim after finding scum. His best play is to just hint around being a cop or hard claim if needed. Keep in mind that we also have a doctor in this setup, so as long as the doctor is alive the cop would be safe. It is also highly doubtful that scum would counterclaim to attempt to get a lynch out of it, since there are only 2 scum.

Claiming day 1 is always a bad idea and should only be done to avoid lynching someone that is pro town.

Read this for more information on the subject of when to claim.