> Federal laws do trump state laws in most cases, it is settled. This simply isn't true. There are areas where federal laws can contravene states laws and area

> Federal laws do trump state laws in most cases, it is settled. This simply isn't true. There are areas where federal laws can contravene states laws and areas where they cannot. Additionally, the federal laws often don't "trump" state laws, but supplement them. Generally speaking (there are exceptions), state law enforcement can only enforce state laws.