Every year, the state and federal legislatures add laws, delete laws, and amend laws that are already in effect. Enforcement agencies often need some time to catch up with these ever-changing laws, and sometimes, there simply is not enough manpower to catch every violator. Prosecuting violators also consumes significant resources, and it is often not practicable to prosecute everyone who violates a law. In short, enforcement agencies often must make decisions about which laws to enforce based on their ability to do so, even though every law in effect should be enforced.