If the FBI sought and obtained the warrant from a federal magistrate, and they found or located who or what they were looking for, they will present the facts to the US Attorney's Officewho will have the proper charges placed.
What you are looking for is a statute of limitations. This varies from place to place. If you have been assaulted, call the police. The authorities make the decision about whether or not to file charges, not you.
Generally only the agency where the crime took place will accept a crime report. In any case, the victim does not file charges. Charges are filed by the prosecuting attorney.
Usually you can't after the injuries have healed unless you have photos to prove it. It's best to file the charges at the time of the incident
Not usually. Although you can file criminal charges for assault.
No. They can have an adult file charges on their behalf though, which is what social services etc. is for.
Only the government can file criminal charges. They do not get into civil matters.
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How do you file charges on someone who will not allow the only living guardian see their child?
Go to your local police station to file a report and say you would like to press charges.
The Government can file charges instead of the police in certain cases and if there is enough evidence to file charges.