It would also depend on how much you're growing, a few plants here might just get you a fine, but say in an ass backwards state where the laws are more stringent you could end up doing time and possibly your parents house taken under the proceeds of crime. Shit creek so to speak. However, the law would need probably cause and a warrant to come into your residence. If you see them pulling up or they're knocking on the door, don't let them enter. Be nice, cordial and state that you know your rights, don't answer any of thier questions, otherwise you're screwed. If they want to come in stating that they suspect a crime is taking place, or that there've been reports of a smell or some strange lights, tell them to get a warrant. Then when they leave, simply destroy your plants.
Being raided will be based on extensive surveillence and evidence, as in you're selling out of your home or you're stealing electricity I wouldn't worry about a a few plants.