1.   Laws had even been passed in some authoritarian societies limiting families to two children, but their enforcement had proved impracticable.

2.   In each state the ballot measure requires that law enforcement prove that a crime has occurred before property can be taken.

3.   Law enforcement has proven a delicate issue for those who would succeed Rudolph W. Giuliani as mayor.

4.   The ballot measures would, in effect, require law enforcement to prove that a crime had occurred before property could be forfeited.

5.   He added that there would be no theoretical problem in recognizing photocopy rights in a revised copyright law, but that enforcement could prove to be a major headache.