Only then did they give him a routine test to detect gunpowder residue on his hands.

And if he tests the paper, he'll find gunpowder residue on it.

No gunpowder residue was found on Amir's hands, clothing, or hair.

Besides, there was no trace of gunpowder residue on her hands.

This removed gunpowder residue and made it hard to determine the shooting distance.

They never looked for gunpowder residue on anyone's hands.

"And yet your report shows gunpowder residue on the victim's hands?"

"I asked the witness whether the gunpowder residue found on the victim's hands was consistent with her holding the gun."

And I got results back yesterday that the corpse had gunpowder residue on his hands.

I knew that there would be gunpowder residue on the clothes.