As a private investigator can I press charges on a subject?

As a private investigator can I press charges on a subject?
Can I press charges against a subject on behalf of my client due to their fear for potential ramifications?

Justin’s Answer
Individual parties do not “press charges”. The prosecutor does. If you suspect someone has committed a crime, you can contact the police or prosecutor and report it. Then the prosecutor will decide if there is enough evidence to press charges.