 Is there an advantage to law enforcement when abductions occur? Law enforcement has some type of lead, possibly on a murder suspect or something of this nature. Could that help? Senate President Pro Tem Greg Treat approved the study and is expected to begin this fall. In what's believed the first study of its kind, researchers at the University of California, Berkeley, have discovered 16 metals in tampons. The study checked 14 tampon brands that are widely available.