Los Angeles, the 21st of February
To whom it may concern,
I write to you in order to tell you the truth about the real culprit. The man who you caught and who's in jail now is not the good one and doesn't deserve what happens to him. You arrested this man because he is black and poor but the evidences of his guiltiness are too weak and you know it. The real suspect is still hiding and I know where he is. I can tell you everything but this man is dangerous and I am afraid of taking risks by revealing the truth to you. I need your protection and then, I will be able to say everything I know about this case.
I hope I could be useful to you.
XXX [mets ton nom]