Is there any way to keep tabs on a homeless person?

My brother recently became homeless. He’s battled with drug addiction for a while and was living with my mom, but after a recent incident, she kicked him out. He’s been on the streets for several days (no car, phone, jacket, etc.). He has a criminal background and mental health issues that have prevented him from getting a job. I’m not in a situation where I can support him, as I have a family of my own and cannot risk him bringing drugs (and the issues that come with it) into my home. But I would like to know if he’s still alive and safe.

Please don’t post any hate here—I’m just looking for resources. I love my brother very much, but addiction really sucks.