I can only offer an opinion no facts, before the opinion have you requested a MSDS sheet on the ink?
The opinion, because of the way sublimation works ie ink turns to a gas during the sublimation process the gas is absorbed into the polyester fabric bonding with it, there really isn't any ink residue left on the fabric, and after a wash I can't see where there would be a problem even if you chewed on the piece of fabric....again this just my opinion.
I'm not really sure anyone will tell you it's safe regardless, because of any perceived liability.
Hope this helps.