A customs official hid the package in a suitcase belonging to a passenger arriving from Hong Kong as a training exercise for sniffer dogs Sunday, but lost track of both drugs and suitcase during the practice session, a spokeswoman for Tokyo customs said.
Um yeah, procedure calls for doing it in a manner that won't result in drugs being distributed to passengers. But the customs official admitted having done this same thing in the past without incident. That is, customs put drugs into passengers bags in order to train and test their drug sniffing dogs without passenger consent or notification.
Which sounds like an abysmally stupid thing to do. And it is. Tokyo customs is requesting that whoever ended up with the sack of marijuana contact them as soon as possible. Good luck with that.
Rule #180 is Don't Use Passenger Bags to Test Your Drug Sniffing Dogs