My comments stem from having been involved in the safe production and usage of many, many billions of primers. There has been nothing yet published about the incident that would suggest something happened other than what the scant reports claim.
A cavalier attitude about explosives will usually lead to problems.
Reason has to step into it. Are you suggesting that a baggage handler on the ground, outside, could identify the explosion of any percussion primer within luggage, excluding far more rational explanations for the sound including zipper pulls hitting the ground, locks hitting metal, plastics on luggage snapping...
Wish the guy luck, though. At minimum, he is in violation of 15 laws with minimum fines of $250.00 each with usual punishments of $12,000.