How am I getting charged with tampering with evidence?

Q: My sister used heroin before I picked her up. She went out in my car I stopped and a car behind me called 911. The guy in the car was helping to get her breathing I was looking for her Narcan. We have Narcan in her purse, in my mother’s home and in her car. In her purse was needles and I never touched them. When a probation officer searched her stuff, a needle fell out her purse onto a busy road. When the fireman found the needle, the cop charged me with tampering with evidence. (Pittsburgh, PA)

A: There is a reason. Their reason will be printed in the Affidavit of Probable Cause section of the Police Complaint, you should have received or will be receiving. It normally gives an explanation as to what the accuser/Affiant saw that prompted the charge. I advise reading this instead of calling the officer directly as you should not make any statements. My other suggestion is to find a lawyer for your Preliminary Hearing so that you can extricate yourself from this situation. I would need to review the charges and the Affidavit of Probable Cause to determine what they say your criminal conduct is.