I'm not too sure what you're asking. I understood it to read that the charge that involved the informant was dismissed against you. Or are you saying the charge against the informant was dismissed, but that he/she is a witness against you? If the latter, i don't know what you mean by a finger pointer. That person certainly could testify against you, but your attorney would also be entitled to cross-examine him/her with respect to what deals/agreements were executed in exchange for testimony against you.
Your question is somewhat confusing as to who is being charged and what assurances you were given by the the police or DA. Ms. Berry-Jacoby has responded as best as possible with the facts stated.
ANDREW ROBERTS CRIMINAL AND TRAFFIC TICKET DEFENSE ATTORNEY