I would imagine if they have a list of identifiable features such as scars he has some sort previous problems a bit more serious than running red lights.
Not necessarily, My dad had a huge scar across the bottom of his face and jaw. Getring at cancerrous tumour in the tongue and the jaw did nothing for his film star looks.
I have minor but visible scars on one hand and a clear incised scar in a finger (serious dog bite as a kid and not enough care wirh a stanley knife when I was old enough to know better) another couple on my wrist where a I got impaled on a broken piece of reinforced concrete and I have tattoos on every limb.
Fair enough I get summonsed to court quite regularly but you tend to as an expert witness in your specilised field.
Police can use marks/scars/tattoos as an ad-hoc quick identity check but such things aren't a necessary indicator of criminality