Professor supports registration even though there is no evidence that it meets cost-benefit test

From the San Francisco Chronicle:

a professor at Stanford Law School who has studied the effects of gun control on crime, said such a law, if passed, would have little immediate impact on crime. 

"I still like the idea of the knowledge you could get from the registry," Donohue said. "But whether it is a cost-effective, immediate crime solver, I am still a little dubious." 

Most gangs and criminals, Donohue said, "are either sending someone to Nevada to pick (guns) up, or they're meeting up with someone who went there for them." . . .

One problem with the end of his answer is that even when guns are banned in an entire country gangs are getting a hold of them.