Can a cop refuse to not file charges on someone as a scare tactic?

Question Details: About 8 days ago I was beaten by a guy. After he attacked me he stole my phone and him and his friends left me stranded in the middle of nowhere. I walked to someone's house and called the police. The police came, asked me for my story, which I gave (with a few alterations to the truth about our intentions to buy weed). He then took me to the station. On the way there I told him the truth about our plans. He had the people involved come to the station. He went on to tell me that he wouldn't press charges agains't them unless he charged me for giving a false report and for attempting to buy a drug.

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