april I have never seen colourless hair. How would the officer know it was hair. 
I feel very certain you have Susan. Take a look next time you shop. There is no such thing as grey hair. It's an illusion created by a mix of hair which has lost it's pigmentation and the hair which thus far, hasn't. IMO, in that light, at that time of the year and that time of day, the police wouldn't have mistaken Nevill for a blond.