joe friar, nbc news, los angeles. >>> now to an investigative unit exclusive. a group collecting cash in front love local grocery stores claims it helps bay area veterans. but we started to looking into it after a viewer, a veteran himself, said he suspected it was a scam. the investigative unit has learned the group is not a charity, it is not a nonprofit. they sit with an american flag and a metal ammo box, collecting your donations. they told our undercover cameras that the money helped homeless veterans, but when we asked for proof, the volunteers walked away. >> here's my card. >> okay. >> i want to ask you a few questions about gift-a-vet. can you talk to us more about how you're actually helping veterans? >> tonight at 11:00, we expose the gift-a-vet founder's run-in with law enforcement and the simple things you can do before donating to any charity. if you have a tip for our investigative units, the phone number is 888-996-tips or you can send an e-mail to the unit@nbcbayarea.com. >> we messagesed that saturday, nbc bay area is teaming up with our sist