Nassau and state officials are cracking down on unlicensed taxis and limos this prom season.

They say they are trying to weed out the illegal vehicles.

Authorities say they will target unlicensed limos, taxis and vehicles driving for Uber and Lyft.

They say they've already issued 27 violations at three proms.

Officials say parents can help by asking where your child's limo is coming from and if the driver has a clean driving record.