Legally, charges can be fired without the alleged victim's consent, since it is the state, not the victim, bringing them. However, there are some specific charges that are criminal only if the victim feels victimized. For example, consensual sex is not rape or sexual assault. Similarly, it is difficulty to imagine that someonw could be harassed by someone if he didn't notice, didn't mind, or even welcomed the attention--a key element of harassment would seem to be missing. That said, if charges are in fact filed, though you may have a good defense, you should still take it seriously and retain a lawyer to help you. Also consider bringing your own charges or civil cause of action against the guard and/or the coworker for trespassing, for violation of your privacy, for harassment, and possibly for defamation as well. You should discuss the situation with an attorney who can evaluate possible causes of action for you.