Tracer

Positron Emission Tomography uses a radioactive tracer to visualize metabolic activity within the human body.

We have a five-man tracer on him now. He's heading for a Vorster cell on Michigan Boulevard, and he's drunk as a lord. Should we intercept him?

A surveyor typically conducts a tracer on his or her own and later meets up with the rest of the team to discuss findings.

Ain't never running but I'm a paper chasing They gon catch up to me, they gon need a pacer How they over-watching me without a tracer

The next morning when she awoke, she told Darcy what had happened, and Darcy agreed that she should go to the police and this time ask them if they could put a tracer on her incoming phone calls, just in case he called again.