In some cases, a crime will be defined as such under both state and federal law. Generally, federal charges may apply in cases that involve more far-reaching schemes, involve multiple states or involve large amounts of money. For example, securities fraud cases are often prosecuted at the federal level because they involve a fraud perpetrated on investors in many states.  Importantly, federal and state criminal procedures are different, meaning that it is important to retain a lawyer who understands the federal system if federal charges are levied.