Unfortunately they can.
Off memory it's called "Inappropriate increase of speed" or something.
Basically; if you gun it at the lights to the speed limit, it's an "inappropriate increase of speed". It carries demerit points and a fine off memory.
Also on the note of undercovers, my friend was going home and a guy was tail-gating him, and with no-where to pull over, he slowed down a bit (hoping they would over-take him).
They didn't, and pushed more, so he sped up, and they did too, it was a 70km/h zone and he went to 86km/h and got pinned for 15km/h over the speed limit.
I realise and know he shouldn't of sped up, but after the slowing down thing, he thought it was the only way to get them off his back.