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A switchblade knife was a piece of evidence in Phoenix Wright's investigation into the murder of Bruce Goodman. The knife was submitted as evidence against Joe Darke as the weapon he used to murder most of his victims. According to the hypothesis laid out by the special team in charge of the case, in August 2014, Darke had killed a pedestrian with his car. He had then killed four other people with the knife, each having witnessed evidence of his previous crime.
- Main article: SL-9 Incident
Darke had the weapon with him when he turned himself in in February 2015. During questioning, the power was cut in a storm. Darke escaped and attempted to take a young Ema Skye hostage. While Neil Marshall was able to intervene, he was subsequently killed by an ornamental blade in Damon Gant's office. Needing decisive evidence and hoping to protect Ema, who she believed had accidentally killed Marshall, Lana Skye broke off the tip of the blade and stuck it in Marshall's fatal wound. This ensured Darke's conviction, and the knife was put into storage.
- Main article: Rise from the Ashes
When defending Lana Skye on the charge of killing Bruce Goodman, Phoenix Wright was eventually able to show the court that the knife was the true murder weapon as opposed to the knife Lana had.