To date, CIS has a 99% success rate. Although CIS greatly minimizes the risks of encountering complications associated with concrete core drilling and/or saw cutting, there is still risk involved. The restrictions of the GPR technology include, but are not limited to:conduits located under rebar that the equipment cannot see; post-tension cables that may be mistaken for rebar. Therefore, the customer must understand that this equipment, like X-ray, will minimize, but NOT eliminate the potential for striking a target.