How difficult would it be to acquire or rig an IMSI catcher for use in counterintelleigence operations? Can the markets help with this? I know they're definitely illegal in the States if a pig is not behind the screen, but are there any bootleg rigs/guides for sale?
https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&SearchText=imsi+catcher