When my son and daughter turn 18 (which will be soon), by law, do I need to give them a 30 day eviction notice?

I live in Tampa, FL.

I want to make sure there are no issues when the time comes.
It's just weird that they can quit school at 16... smoke pot, hang out at the house with the friends eating all your food while your at work but yet you can't kick them out until they are 18.

One of them was on probation and had broken every rule they were given including testing positive for pot but since they will be 18 in two months the state has decided to just let them off probation since they will be 18 soon...