What can I do if I was arrest with drugs in my bra, I told the police it was someone else’s?

If the drugs were found in your bra it will be hard to say that they did not belong to you, but that is not the issue since you "possessed them" whether they belonged to another person or not. If the search was illegal the drugs can be suppressed unless you consented to the search or told the police that you had drugs.

Tell the truth against him if that was part of any plea deal that you had.

Your question requires an attorney consultation. It is not a simple question that can be answered on this type of forum. There are many factors that would need to be considered and evaluated. To begin with, what are someone else's drugs doing in your bra. I strongly suggest that you contact an experienced criminal defense attorney for a face-to-face consultation and give him/her all of the facts surrounding your case. He/she would then be in a better position to analyze your case and advise you of your options.

If the drugs were in YOUR bra... you are in possession. Did you not know they were there? Did someone put them there without you knowing? I have a tough time believing they were not yours.

There are not enough facts given to get any sort of coherent answer to this question.