How can a Missouri rider quickly tell the difference between a DOT-compliant helmet and a 'novelty' helmet?

1. The novelty helmet is heavier
2. DOT-compliant helmets have a 'DOT' sticker on the back, a foam liner at least about an inch thick, sturdy chin straps, and typically weigh about three pounds
3. Novelty helmets are usually full-face
4. DOT helmets never come in black