Actually, that's a good point.
How about a sticker dispenser, so if you get drive stunned you get a little gold star embossed with a unique ID stuck to your clothes?
Actually, given the current government it's more likely that they'd use "drive stun" to staple a £200 bill to your body. Then give the police incentives to drive-stun passers-by.
Good to see that they're using the "threaten" option rather than just reflexively tasering people, and it's good to see that they've not just gone out and tasered everyone who looked at them funny or was in posession of an offensive wife.
I mean I'd rather they weren't available, but at least they appear to be avoiding utterly excessive usage. We just need a police helmet-cam now and there'll be no worries about unneccesary police brutality.