Homeless people keep leaving markers in my neighborhood?

Nothing really you can do but as far as the needles I would call police.

I have that in my neighborhood. I kept seeing homeless walking up and then in front of my house and then down the street. It is a shortcut through my neighborhood. I couldn't figure it out until I saw the back of the stop sign and the no parking sign pointing the other way. There on the back someone used a "Sharpie" and there was a note that I couldn't understand and an arrow. Also I had a huge redwood tree growing in my front yard and it began to stink to the point my neighbors complained to me. When I had the lower 6ft of branches trimmed I found it to be a homeless toilet station. Here's the rub, after I had it trimmed they now use my front porch to defecate and urinate.

When I complain to the Sheriff's Dept, they just tell me to file a report with the Safety Officer... The Safety Officer never answers the phone.

I will sell the home this year and move out of California. Wonder why I never give money to a bum on the off ramp? This should have answered that question.

Move to a better neighborhood ? You can't stop it. Just like a street sweeper, the next day it looks like the weren't there.