Look for signs of drug-related activity (plastic bags, needles, spoons on the property and so forth).

Point in case Project manager of a plastic injection molding company makes $200K/yr.  

But, If your signs are corrugated plastic, like most professionally made signs, then put them up.

The plumber ran some kind of flexible plastic tubing through the attic to by pass all of the infrastructure. 

Think about it, you are going to get moisture penetration so do you want to block it from escaping with a piece of plastic and then put a nice paper backed sponge in between to hold that water around your wood framing?

If the Tenant challenges it and you have to go to court, you will be hard pressed to find a judge that will side with you as the landlrd trying to make the tenant pay for a 5 year old fridge because he broke the plastic bins and glass shelves out if it.Additionally, IF the judge DOES side with the Tenant, you could be looking at paying the tenant back x double in damages (at least in AZ they can collect up to 2 month's rent or twice the cost of security deposit withheld).So I am just saying that it's a risk. 

I am considering having glass block windows installed (after removing the rotted double hung windows) and finishing the tub surround with Fiber Reinforced Plastic (FRP) panels over green sheetrock.Any suggestions or comments are greatly appreciated!!

Clothes, food, plaster, boxes, plastic bins, classic trains, human urine and feces you name it.But believe it or not it was such a screaming deal I had to pull the trigger.

Sometimes if you search for Plastic Signs [Your City] or Corrugated Signs or Coroplast sp?

@Krista Mcknight I purchased 12x18 yellow blank plastic signs from dirtcheapsigns.com.