The nullification trend in statehouses seems to be spreading.

Law Blog wrote last week about California lawmakers who are proposing a Fourth Amendment Protection Act that would ban state workers from helping the federal government gather metadata on Americans without a specific warrant.

That measure followed on the heels of several bills introduced in other regions of the country seeking to criminalize enforcement of federal gun laws.

The latest target is the Affordable Care Act. Conservative lawmakers in at least seven states have proposed laws that would prohibit state agencies and officials from helping the federal government implement the federal healthcare law and would authorize the state's attorney general to sue violators.

The Tennessean wrote about a bill introduced there on Thursday: