When terror struck the Waukesha Christmas Parade last fall, it was hard to fathom. Who would do something like that? Seven months later, Darrell Brooks is planning to mount an insanity defense. On this episode of Open Record, former Wisconsin Supreme Court Justice Janine Geske explains what Brooks would have to prove to succeed. Plus, how the case of Jeffrey Dahmer may shed some light on the challenges facing Brooks' legal team.

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