Actually, the problem was that the teens were driving around in a pickup truck when driving was banned due to a blizzard (that never actually happened). The cop told them that they could do their thing after the storm was over the next day. No ticket, no arrest, I think the cop wanted to be seen as having responded to the call without going nuts on anyone.
BTW, the cop only also showed up because some tout called the police and snitched on the teens. Shame on the snitching little busybody, hope they slip on some ice and bust their nose…