Can an employer only fire 1 employee for a violation if another employee had done the same thing with no repercussions?

Question Details: My wife was fired for marking herself as in the office for a portion of a day, when she was not in for this portion. This timeframe was a total of 4 hours during a company party, during which nobody was working. She took the action after another employee informed her that she had done so, as due to an oversight neither of them were informed of the party. The manager knew that both employees took this action, however the other employee was not reprimanded. The difference is that my wife had an FMLA protected illness.

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