But court challenges have blocked implementation of the new notification laws in several states.

Children's Rights, a nonprofit advocacy group, notified the city two months ago that it would ask the courts to block implementation of the city's planned changes.

The "Barr Amendment" to the 1999 Omnibus spending bill not only blocked implementation of Initiative 59, but also prohibited the vote tally from even being released.

As of August, 2011 it remains to be seen whether or not efforts to block implementation of the SRA fee will be successful.

Four years ago, Mr. Hackeling tried to block implementation of the licensing law, and on April 2, he said, he will introduce a resolution to repeal it.

The group organized as the Sons of Liberty and pledged to block implementation of the Stamp Act.

In protest, Bosnian Serb authorities suspended all communication with the Government, blocking further implementation of the Dayton peace agreement.

Carolyn Wade, president of Local 1040 of the Communications Workers of America, said the union had sued to block implementation of the plan.

However, Hudson did not block implementation of the law while the case continued working its way through the court system.