Pop-up testing sites have cropped up on street corners, in parking lots and on shopping properties across the country, but health and legal experts say many of these are unregulated and could be rife for nefarious activities like identity theft.

In the last few weeks, legislators and attorneys general in several states including Illinois, Maryland, California, Texas and Pennsylvania have said they will be investigating and introducing regulatory legislation overseeing these operations.

Numerous illegal, unapproved and unsanitary sites have been cautioned by state officials nationwide.