How safe is the Sharpsmart system from people being able to put their hands in the container and pull out sharps?     

An international study has proven the Sharpsmart sharps container to be a safer sharps container with no reported incidents of hand-entry and retrieval of sharps and not a single reported injury due to container penetration. Sharpsmart sharps containers are designed to be open at all times until closed for disposal. The patented counter-balanced tray together with adherence to recommended mounting heights ensure sharps are not accessible once discarded.