A forensic biologist testified Monday at the trial for a Suburban Hospital maintenance worker accused of killing his boss, but could not tell the jury about what prosecutors consider some of her key findings.

Erin Farr of the Montgomery County crime lab testified that 40-year-old Roosevelt Brockington Jr.’s DNA was on the exterior of a glove recovered from the basement boiler room where he was killed. But Farr was not permitted to tell jurors that the brown stain she saw on the wrist area — the area from which she took the DNA sample — was blood.

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