So gun laws don't work?

Via Pew: 

Under New Jersey’s new bump-stock ban, which was approved in January, residents were supposed to destroy or turn in their bump stocks by mid-April.

So far, New Jersey State Police say, they have not received a single one...

It’s hard to know for sure, but Americans could own as many as 520,000 bump stocks, according to estimates from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Many of the devices are untraceable, in part because they don’t have serial numbers.

New Jersey is not the only state having trouble enforcing its ban. In Massachusetts, where residents had until February to surrender their bump stocks, State Police received just three devices. The Bay State’s ban, which passed in November, is a felony.

Read more here.