This video takes place on a stretch of 6th and 7th Streets in downtown Los Angeles. At it's closest point, it is six blocks from the LAPD Headquarters (which is located on 1st Street). The federal building in Los Angeles (which is where the DEA, FBI, US Marshals, etc all have offices) are one further block away from the LAPD Headquarters. Between those two buildings is City Hall.
The stretch of tents in this video represent what is probably the highest percentage of drug addiction in the United States. It is well north of 99% drug addicted. It is six blocks from LAPD headquarters and seven blocks from every federal law enforcement agency in existence.
The first time I was in this area was 38 years ago. It did not look like this. Yes, there were some homeless and yes, many of those homeless were drug addicted ... but you did not have tents set up, you did not have garbage everywhere, the cops didn't just ignore it, and the area was generally safe and generally clean. The next time I was in this area was 20 years ago ... at that point, you had some tents. But they were few and far between. You had a lot of homeless, but purchasing drugs was still a process. If you wanted to buy drugs, you had to know a guy, who would present you to another guy, who would tell you about a guy in a building down the street, and maybe at the end of the process you'd find a guy actually selling. Today? Tents are endless. Everyone is drug addicted. Every single one of those tents has drugs inside it (or a human being who just ingested the last of the drugs that were inside it). You can purchase from basically anyone (because they know they can charge more and just go buy more at the "regular" price from an endless amount of sources on the same street).
This exists because the politicians (federal, state and local) want it and because these politicians have ordered the police not to do anything about it. These people are treated worse than animals, but nobody cares. The residents in the area hate it, but they are powerless to do anything about it other than move (which anyone with the money to move has already done) out of the city.