Isn't there some sort of metal detector you can use to check loads before and even after they are loaded and unloaded from the washers?I would think besides being a hazard to personell-the sharps could damage the machines and the items you are washing.Metal detectors are used by sawmills for checking logs for metal-metal items in logs can damage sawblades-as well as causing the blades to break violently and the peices can have the force of a bullet!a bullet in a log can do that.I would hate to imagine what a sharp can do in one of those 285lb washers when it goes to spin!I don't know what sort of detector you would use for glass items.