Many of recent mass shooters had posted items of concern on social media but none of them had concealed weapons permits. Thus, this would not have stopped any of the recent mass murders.

As missed warning signs pile up in investigations of mass killings, New York state is rolling out a novel strategy to screen applicants for gun permits. People seeking to carry concealed handguns will be required to hand over their social media accounts for a review of their “character and conduct.”

It’s an approach applauded by many Democrats and national gun control advocacy groups, but some experts have raised questions about how the law will be enforced and address free speech concerns.

Source: New York gun applicants will have to hand over social accounts

Further, in many cases, the individuals had already been in contact with the police (Highland Park) and mental health (Buffalo) experts before shooting. None of the in-person experts saw a problem.