In this Nov. 1, 2018 photo, Laurel Foster holds her phone in San Francisco. Foster is among teens involved in Stanford University research testing whether smartphones can be used to help detect depression and potential self-harm.
In this Nov. 1, 2018 photo, Laurel Foster holds her phone in San Francisco. Foster is among teens involved in Stanford University research testing whether smartphones can be used to help detect depression and potential self-harm. Haven Daley AP Photo
In this Nov. 1, 2018 photo, Laurel Foster holds her phone in San Francisco. Foster is among teens involved in Stanford University research testing whether smartphones can be used to help detect depression and potential self-harm. Haven Daley AP Photo