one of america's most picturesque cities, san francisco. >> that's crystal meth right there. >> reporter: i'm in the tenderloin neighborhood. you can see tents and tarps lining the street. this is typical of what you'll find in the neighborhood. residents are mortified, we're beyond wits' end. san francisco is facing multiple crises. its homelessness problem has been out of control for years, but covid made it even worse. that has exacerbated a raging mental health and drug crisis, with an overdose rate flying off the cdc charts. that purple line, san francisco. a record 712 deaths last year, doubling those who died of