As adam said and most cops will tell you
They will usualy give up to a 5mph grace…
Hardly anyone does exactly the speed limit… not because theyre rebels but simply because especialy older cars there always seems to be a ~3mph difference then what the radar says vs your speedo.
If this was the case cops would be pulling over nearly everyone and giving them tickets for going 3mph over…
A judge will dismiss it… being pulled over for 2mph is completely ridiculous and asinine