Isn't the ticket downloaded to the device ? Because each ticket can only be downloaded once (according to the FAQ) I guess it would work if you hadn't downloaded the ticket...........just the ID check to negotiate then (assuming you're happy to risk losing your ST and taking a long ban if found out ?)
even if its on the phone which surely cant be as what happens if get new phone? then hand phone to the person. if its a trusted family member i guess for any that wont be any more than an inconvenience. if i was sharing i would personally look at a dedicated phone just for the ticket. bit extreme but wont surprise me if some do that.