> reporter: phoenix, arizona, where single mom richards moved her family here in 2015, it felt like a fresh start. >> if i would have known what i know now i would have never came here. >> reporter: after she gave birth to her youngest daughter, hospital staff decided to drug test her. richards says she didn't use drugs but her daughter's test came back positive for amphetamine. >> i just kind of lost it at that time. i kind of knew the end results of it. >> reporter: a caseworker with the state's department of child safety came to investigate. >> that was stressful. >> that was beyond stressful. that was degrading. >> reporter: case records richards provided to nbc news and propublica show it was found to be a false positive. just months later richards was investigated again when she brought the same daughter to the Get Live News Updates Every Minute from vimarsana.com Curated from 23000 News Agencies."> > reporter: phoenix, arizona, where single mom richards moved her family here in 2015, it felt like a fresh start. >> if i would have known what i know now i would have never came here. >> reporter: after she gave birth to her youngest daughter, hospital staff decided to drug test her. richards says she didn't use drugs but her daughter's test came back positive for amphetamine. >> i just kind of lost it at that time. i kind of knew the end results of it. >> reporter: a caseworker with the state's department of child safety came to investigate. >> that was stressful. >> that was beyond stressful. that was degrading. >> reporter: case records richards provided to nbc news and propublica show it was found to be a false positive. just months later richards was investigated again when she brought the same daughter to the Get Live News Updates Every Minute from vimarsana.com Curated from 23000 News Agencies." property="og:description"> > reporter: phoenix, arizona, where single mom richards moved her family here in 2015, it felt like a fresh start. >> if i would have known what i know now i would have never came here. >> reporter: after she gave birth to her youngest daughter, hospital staff decided to drug test her. richards says she didn't use drugs but her daughter's test came back positive for amphetamine. >> i just kind of lost it at that time. i kind of knew the end results of it. >> reporter: a caseworker with the state's department of child safety came to investigate. >> that was stressful. >> that was beyond stressful. that was degrading. >> reporter: case records richards provided to nbc news and propublica show it was found to be a false positive. just months later richards was investigated again when she brought the same daughter to the Get Live News Updates Every Minute from vimarsana.com Curated from 23000 News Agencies.">