Concrete scanning of an elevated slab leaves a very clear image for GPR as we can see the bottom of the slab and everything in between. The only thing we can not see doing concrete scanning is directly under steel like rebar. This is why we recommend on all concrete scanning jobs to not drill, cut, or core on our lines. If a conduit is directly under rebar our system would not be able to detect it. However the clear space between our lines are 100% risk free and guaranteed by us as safe to drill, cut, or core.