The camping ban forces the homeless to hide, making it impossible to get an accurate count, but this is useful in terms of the composition of the homeless. Note that of the 1,451 people counted, "232 people have chronic alcohol/substance abuse issues", which is only 16 percent. 434 people have a mental illness, which is 30 percent. These figures are important because many people think addiction and mental illness are the main drivers of homelessness. They're certainly a factor, but most homeless don't fall into those categories (especially since there was probably a lot of overlap). I believe that the stress of homelessness is a driver of addiction and mental illness.

http://www.lanecounty.org/media/news/pages/pr_hhs_homeless_count_results.aspx