Finally, your last couple of sentences, you are incapable of discerning between "the police" as an organisation, and the "Met" in particular, and a single black person who is an individual, not an organisation, not representing an organisation.
In addition, if your assertion is that he must have been lying because he is black and black people have told lies before, really does demonstrate your racial prejudice.
The police may have been white, does it follow that because white people have told lies before the police must be lying?
The mind boggles.