Instructions for families ia to buy a dna kit at the drugstore (don't have that company process the kit as it is too expensive and will not put their dna into the general population for comparison) and contact ftdna.com for an overnight delivery of their dna kit which also uses cheek swabs.  Use the swabs from the first dna kit and have the funeral director swab inside the person's cheek multiple times with multiple swabs.  Let air dry and  place them in  paper envelopes.

Use the kit mailing envelopes from ftdna and contact them by phone to let them know what ia going on.  Send with a tracking number so you ensure you know they were delivered.