Possession of unregistered silencer or of bomb or similar device prima facie evidence of unlawful purpose

45-8-337 . Possession of unregistered silencer or of bomb or similar device prima facie evidence of unlawful purpose. Possession of a silencer that is not registered under federal law or of a bomb or similar device charged or filled with one or more explosives is prima facie evidence of a purpose to use the same to commit an offense.