Here in the San Francisco Bay and Sacramento regions we have started hearing a "baby monitor" type devices using GMRS 462 and 467 MHz primary repeater frequencies, in nursing home settings (given the message content).  We are aware of about twenty incidents of this over the past three months, but the rate of occurrence is rising.  The most recent was strong enough to interfere with a CERT/Fire Council repeater out here.    These typically operate during daylight periods, and appear to be conti