Just to let you know first, I am a lawyer in the Seattle, so Minnesota may be slightly different...but, what you did when you made the call was to tell them what you thought was going on. It turns out that you may have been wrong. That's not dishonesty, that's just being wrong. If the police were going to be as unfriendly as humanly possible, they could try and charge you with falsifying a statement to a law enforcement official (or something like that), but again, your defense is just that...