In fact, I'm sure the majority of football players who smoke marijuana do so for the medical component without even realizing that's the case because it is without question the best pain management drug in the world.Now I'm not suggesting this person who was arrested for marijuana was using for this reason, but it's actually possible it treated some depression issue, or something else. 

If they are arrested for drug activity at home that will make it easier for you to evict them.

However if he were arrested behind the wheel on your property you might have more grounds.  

It does protect you from being arrested if the government doesn't like what you say.Gun ownership is not a protected class.

try telling the lender that you trying to buy this $749,000 house on undocumented freelancing income and you liable to get arrested on the lenders premises much less get a mortgage :)

In Redding, CA the drug addicts shooting up heroin in the parks was so bad rather than arrest them, they removed the playground equipment, and the public libraries in many towns are overrun with sexual predators using the computers.

No slime ball con man wants to be arrested as a drug dealer.

And IMO there should be standards that will help landlords understand who is a good applicant and who is not (beyond no criminal history) there is a time coming soon where declining folks based on time served in prison, arrests etc will no longer be allowed. 

Police aren't even arresting people shooting heroin on the sidewalk in downtown.

You'll likely end up arrested and in jail for a self help eviction and that tenant will end up owning the property.