"Chanel Lewis voluntarily gave police a DNA sample when he appeared on their radar in the murder of Karina Vetrano. Now new details surrounding his past could get that DNA sample thrown out."
"Retired NYPD Sergeant Joseph Giacolone says there could be potential issues in court with that voluntary DNA sample if it turns out Lewis has a mental health problem.
"He is of age, but in order to give something, it has to be be done voluntarily, intelligently and knowingly," says Giacolone.
Giacolone says the defense will more than likely want that DNA profile thrown out, but says there is also the confession, which is tough to ignore."
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