The procedure followed by personnel issuing PLBs and EPIRBs in Blue Mountains, Australia seems to be a major factor in helping to reduce the local number and percentage of false alerts:

“Officers did spend 15 minutes with those borrowing the EPIRBS to make sure they understood how to use them.

“Personnel … explain how to use the device and go through the process with the person before they leave the station.

“Station personnel also identify to the user that there are simple instructions on the rear of the device.

“The user is issued with a pack that contains a document on how to use the device and this is also identified to the user.

“Thanks to a high rate of registration, in many cases search and rescue officers are able to contact beacon owners and verify it ... before tasking search assets.

“Mishandling, incorrect storage or incorrect disposal put pressure on police resources”

Read more here:
http://www.bluemountainsgazette.com.au/story/4524754/its-a-real-emergency-here/