If a person opens your mail without permission and you press charges against this person, what would be the mo?

You would have to say how they opened the mail. MO means modus operandi. Loosely translated to method of operation. It's a way of linking numerous crimes to one suspect. Criminals are like everybody else, they tend to do things a certain way. Some burglars kick doors down, some break out windows, some pry doors open with a crow bar. Each of those is an MO. The MO would be the method in which the person opened the mail. Which really wouldn't apply in a case like this.

You can't press charges. The government presses charges.

You go to the post office, ask to speak to a postal inspector (The Post Office's own police department) and make a report. Then it's out of your hands.

Richard

i like too press charges on cheryl fey she had open my mail and stoles money i want her in jail until she pay my money back her address is po box 27 campbelton fl 32426

Tampering with federal mail. It's a felony.

if the mail has been delivered to its intended address the post office has no more jurisdiction anyone at that address can open the mail