Marchman Act and Baker Act
Laura Naredo, Chief Operating Officer of South Florida Behavioral Health Network, explains if your loved one is suffering from substance abuse disorder and he is unwilling to get help, you can petition for a Marchman Act, which would allow you to get them assessed and see what level of care they would need.
She also points out the Baker Act, which has to be done by a qualified professional (a doctor, a psychiatrist, a clinician, or law enforcement), and it is available for people suffering from a mental illness.