Is it legal to videotape my spouse behaving badly (verbal or physical abuse, infidelity, etc) as evidence in a divorce case?

As thoughts turn towards divorce, tempers can flare and people may behave in ways they normally would not be proud of, even in a relatively amicable situation. Of course, the bad behavior of a spouse—ranging from neglect of household duties to infidelity to abusive actions—may well have begun long before the divorce, and may well…