Keith McMahan testified on Day 14 as a forensic drug analyst about laboratory testing that identified AB Pinaca in a crushed can and foil-packet material. Cross-examination established that the substance's effects on the human body were outside his expertise.
Expert witness
Keith McMahan
Mississippi forensic scientist specializing in drug analysis at the Meridian Regional Branch laboratory.
Appeared2019 Murder Trial
43 lines·3 proceedings
About
Keith McMahan testified on Day 14 as a forensic drug analyst after the court qualified him without defense objection. He described the laboratory handling and testing of State's Exhibit 58, reporting AB Pinaca residue in a crushed aluminum can and AB Pinaca in two foil packets containing a combined 3.765 grams of plant-like material.
On cross-examination, defense counsel Robert Madsen asked about AB Pinaca's effects on the human body and the timing of federal and Mississippi restrictions. McMahan said the substance's effects on the human body were outside his expertise, and he identified July 1, 2014, as the Mississippi restriction date.
On redirect, McMahan confirmed that AB Pinaca was illegal in Mississippi in September 2014. The parties then stipulated that blood collected from Timothy Ray Jones, Jr. on September 7, 2014 tested positive for AB Pinaca, and State's Exhibit 70 was admitted.
Key Points
McMahan testified that residue from a crushed aluminum can and plant-like material in two foil packets tested positive for AB Pinaca. [1]
He described the laboratory's bar-code, vault, checkout, inspection, and sampling process for the submitted evidence. [1]
On cross-examination, McMahan said AB Pinaca's effects on the human body were outside his expertise and identified July 1, 2014, as Mississippi's restriction date. [1]
On redirect, McMahan confirmed that AB Pinaca was illegal in Mississippi in September 2014. [1]
Trial Record (3)
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