If its like every taser I have ever heard of, its a one-shot thing (though if he knew what he was doing he might have been able to remove the bit that shoots the wires and just have it as a contact taser).
Though watching
@Nymzee's video there it is perhaps significant that the cop who chases him looks like they still had their taser (they throw it away just before they get their gun out), and their colleague wasn't nearby (though one might have been coming into shot at around 0:15).
The cop might have had justification to do that (shoot him) - though the taser would be non-lethal, being stunned by it would mean they would have reason to fear that they wouldn't be able to stop the bloke taking their actual gun off them.
Its the sort of thing that really needs a jury to decide one way or another.