There are laws to require registration but no enforcement per say. They are relying on local LEO to enforce. And there is not any real push to crack down. BTW there is flight restrictions out to 5 mi. of Airports. Not total no fly, but there altitude restrictions that taper out to the 5 mi. mark and max altitude of 400'.
https://www.airmap.com/
they have apps for phones
https://verifly.com/
$1mil insurance for an hour of flying for around $10, more in some areas.