Checking employees bags before leaving the store is common practice for retail stores, especially those that operate in shopping malls. I worked at Banana Republic for 4 years, patiently waited for managers to check my bags before leaving the store after the end of my shifts, don't have a problem with it....these clowns are just trying to get money out of Apple, simply nonsense.....
It's actually the law firms. I seriously doubt these employees thought this up on their own. There are firms that research all manner of possible violations that would allow some large class of people to claim harm. They then determine which venue might be most favorable to file suit in. Only after they've done all the prep work do they actively shop for plaintiffs. The legal system in the U.S. is rather permissive when it comes to civil suits. You can pretty much sue for almost anything. Does not mean you'll win, however, most large corporations just settle because the cost to go to trial is rather steep. Remember, class action plaintiff firms wouldn't exist if this tactic didn't regularly yield large fees for the firms who engage in these practices.
However, this tactic may not work with Apple. They have a demonstrated willingness to litigate through trial.
Tort reform is really something that needs to be addressed. There should be more consistency across jurisdictions to reduce venue shopping and some reasonable check to stop frivolous claims (not that this claim is necessarily frivolous).
Cheers,