Requires certain communications providers to disclose available device location information immediately to law enforcement officers or public safety answering point (PSAP) agents in emergency situations when the officer/agent asserts the device placed a 9-1-1 call within the prior 48 hours or there is reasonable suspicion someone is in danger. The measure obligates agencies to log requests, gives providers immunity for complying, and adds or clarifies definitions for covered services and investigative or law enforcement officers. The bill also includes a conforming amendment to 18 U.S.C. 2707(a), but the excerpted text to be inserted there was not provided, so the effect of that change is unclear from the available text.