Once you have started talking with the customer, the goal is to ask
to see his/her purchase so you can match the merchandise
to the
receipt to ensure tags were deactivated or ink tags removed
at
the
POS. What is the most appropriate action to take?
Grab the purchase.
Take them by the arm and say, "Please come with me so I can figure
out what you did to set off the alarm system."
It's fine if you don't find out why they caused the alarm to sound.
Politely ask for the product (do not grab it), and ask, "Can I check
the merchandise and your receipt please?"