Katherine "Kat" Yanez stepped out of her tent, took a long drag from her cigarette, and scanned the faces outside a row of tents for signs that someone was overdosing on heroin.
A longtime heroin user herself, Yanez has learned to spot the symptoms: the slackened jaw, pale lips and drooping eyelids. Twice in the past month, she has saved a homeless companion in this camp from death with a shot of naloxone, a drug that reverses the effects of heroin. She keeps a rescue kit in her backpack.

"It's just a matter of time before someone dies out here," said Yanez, 33, as she stopped to help a young man slumped over in the midday heat.
Yanez lives at the heart of a sprawling homeless settlement that has formed and grown quickly this summer in the shadows of the Little Earth housing project near the intersection of Hiawatha and Cedar avenues in south Minneapolis.
Their numbers have multiplied in recent weeks, reaching about 60 men, women and children this week, turning this narrow stretch of grass into one of the largest and most visible homeless camps ever seen in Minnesota.
The camp dwellers, who are mostly American Indians, say they feel safer watching over each other in a large group than living scattered on the streets; they are determined to remain despite repeated attempts by the state to clear them out.
The growing tent city has alarmed county health officials and American Indian leaders, who say the lack of hygiene facilities and frequent reuse of needles have made the area ripe for infections and disease outbreaks. The camp has several known cases of a drug-resistant infection known as MRSA, or methicillin-resistant Staphylococcus aureus, which can lead to sepsis, pneumonia, bloodstream infections and death. There are also reports of hepatitis C, sexually transmitted illnesses, and scabies.
The area surrounding the encampment is rife with hundreds of used needles, garbage and human waste, despite stepped-up efforts by campers to keep the area clean. There is just one portable toilet, and many campers bathe in the open near their tents by pouring jugs of water over their bodies.