The OPP is ramping up its efforts to find the murderer of 65-year-old hitchhiker John Hatch, who was found dead near Erin, Ontario, on December 17, 2015. He was last seen alive the day before, outside Ottawa.

Now, the OPP has announced what it’s describing as a “new investigative technique” for the force: obtaining the phone numbers of everyone who was in the area where and when Hatch was last seen alive, via a court order, and sending each person a text message directing them to a police website. If they follow those instructions, they’ll be asked a series of online questions.