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Episode Summary

The initial investigation into the death of a research scientist leads to an animal-rights group until evidence surfaces that her husband's affair with a coworker may point to a possible motive for the murder.
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    Trivia, Notes, Quotes and Allusions

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    • Trivia

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    • Notes

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      • International Episode Titles: Czech Republic: Prvotní instinkt (Primal Instinct) Edit
    • Quotes

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      • Lennie Briscoe: (about an animal rights group) They've got 2000 members in Manhattan alone. I didn't know we had that many animals. Mike Logan: You oughta ride the subways. Edit
      • (Describing Susan Boyd's mental state.) Dr. Elizabeth Olivet: She may act and look normal, but talk to her about the affair and you'll find that she's receiving coded messages from the patterns of his ties. Things as unrelated as his expense report, a song on the radio. Edit
      • Susan Boyd: What's the difference between a Stalin purge and a Walsh midterm? Stalin tried to re-educate you before he killed you. Edit
    • Allusions

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      • Paul Robinette: One small step for privacy, a giant leap for conspiracy. This is a play on Apollo 11 Commander Neil Armstrong's words when he became the first man to walk on the Moon on July 20, 1969. Armstrong famously said, "That's one small step for [a] man, one giant leap for mankind." Edit
      • (About the noisy road work.) Police Officer: You couldn't hear Axl Rose. Axl Rose is the lead singer of the hard rock band Guns N' Roses. He's known for living out the "sex drugs and rock and roll" lifestyle. Edit
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