The question is in the title, but I'm wondering if there's any risk to filing a police report against someone who broke a contract and stole $10,500 from me. The police report is being filed in Washington DC, and I'm very confident that he should be found guilty as I have clear evidence and 3 witnesses, but I want to confirm this before filing it.
No, filing a police report in good faith does not expose you to liability
Of course, making false allegations or allegations where you are recklessly indifferent to the truth to police is both a serious crime in itself and defamation.
Of course, breaking a contract is not a crime and the police are unlikely to take any action. If you borrow money from the bank and don’t pay it back, that’s not stealing or fraud unless it can be proven that you had no intention of paying it back when you borrowed it. This is a civil matter for the bank, not a criminal matter for the police.