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Dear Hainesport, New Jersey:
Because you are employed by the Department of Defense, there are special regulations which probably apply to your situation, since the DOD is a government employer; and because you may be working with secured, sensitive or classified information. (Please don't provide that information; JustAnswer is a public website.)
Without knowing the particular regulations you are subject to, it appears that the employee may have violated the Electronic Communications Privacy Act, which is available here: http://www.usiia.org/legis/ecpa.html. Section 2511 prohibits the interception of electronic communications. Here is that section: http://www.usiia.org/legis/ecpa.html#s2511.