The Rhode Island House has approved a bill that would require all state public schools to have the opioid antidote drug naloxone.  The drug can be given as a nasal spray or an injection, and quickly reverses the effects of an overdose of heroin and other drugs.  The bill provides immunity for any school personnel who administer naloxone, and does not require school nurses to be trained in use of the drug.  The measure advances to the Senate, which passed a similar bill earlier this month.