Common defenses to juvenile handgun charges include (but are not limited to): You were 18 years (or older) at the time of the alleged offense; You didn't know you had a handgun in your possession; You fell within one of the listed exceptions to 18-12-108.5 C.R.S. (because you had the permission of your parents and were engaging in a legal or constitutionally protected activity); You were at home and possessed the gun for self-defense with the permission of your parents or legal guardian; or The gun was discovered during an illegal search and seizure in violation of your Fourth Amendment rights.