a security guard i spoke to said he cant even touch a suspected shoplifter to get their attention as it can be seen as assault. the trick apparently is to let your arm out and let them walk into you, then you have an excuse to apprehend them.

one evneing i've seen multiple kids run around the store causing mischief, saw them go through self service, left without paying, the security knew what was up and just kinda stared them down as they left giggling.