More and more Virginians are obtaining police powers using a little-known provision of state law that allows private citizens to petition the courts for the authority to carry a gun, display a badge and make arrests. The number of "special conservators of the peace" — or SCOPs, as they are known — has doubled in Virginia over the past decade to roughly 750, according to state records, reports the Washington Post .

The growth is mirrored nationally in the ranks of private police, who increasingly patrol corporate campuses, neighborhoods and museums as the demand for private security has increased and police services have been cut in some places.

The trend has raised concerns in Virginia and elsewhere, because these armed officers often receive a small fraction of the training and oversight of their municipal counterparts. Arrests of private police officers and incidents involving SCOPs overstepping their authority have also raised concerns.

The Virginia legislature approved a bill Friday increasing the training and regulation of SCOPs. The private officers would now be required to train for 130 hours, up from 40 hours — less than the state requires for nail technicians, auctioneers and security guards.

SCOPs are free to call themselves "police" in Virginia, ­although the new bill would ­require court approval.