Read about it HERE, there have been numerous other reports circulated by email.
The best solution is to boycott the duty free shops and indeed all shops at airports in Thailand, and be very very careful elsewhere in SE Asia too.
Give them a wide berth folks, shop elsewhere.
The duty free shop in Changi Airport, Singapore and in Kuala Lumpur International Airport, Malaysia, should be OK. But when ever you shop, always remember:
Let the buyer beware
HELP ERADICATE ALL FORMS OF CORRUPTION, FROM THE TOP TO THE BOTTOM