Nick Reiner Case: How a 180-Year-Old Legal Rule Could Set Him Free

The legal battle over Nick Reiner's fate will likely come down to a test created in 1843 after a delusional man shot the wrong person on a London street. The M'Naghten Rule has been used for more than 180 years to determine when mental illness excuses murder. It's about to be applied to the man charged with killing Rob Reiner and Michele Singer Reiner in their Brentwood home.

Here's how the rule works: Two prongs, only one required. Prong one—you didn't understand the nature and quality of the act. Prong two—you didn't know it was wrong. Most defendants can't use prong two if they fled, hid evidence, or showed awareness of wrongdoing. Nick Reiner reportedly checked into a hotel after the alleged killings and spent more than 24 hours navigating Los Angeles. That behavior likely kills prong two for him.

Which leaves prong one: nature and quality. This is exactly what worked for David Carmichael, a Canadian father who killed his 11-year-old son in 2004. Carmichael planned the murder, researched prison sentences, expected 25 years. But his delusion—triggered by the SSRI Paxil—made him believe his son was suffering, brain-damaged, and dangerous. He didn't understand the true reality of what he was doing. He walked free in roughly two years.

Nick Reiner's medication for schizoaffective disorder was reportedly changed approximately one month before the alleged murders. His meds still aren't stabilized. He reportedly still believes his incarceration is a conspiracy. But does that mean his perception was distorted during the act itself? That's the question the defense must answer—and the question that will determine whether a rule from 1843 sets him free.

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This publication contains commentary and opinion based on publicly available information. All individuals are presumed innocent until proven guilty in a court of law. Nothing published here should be taken as a statement of fact, health or legal advice.