Remember that one clue alone is less likely to indicate marijuana use than several together. Maybe the towel is there because of a draft in the hallway. In many cases, the towel is used to block the smell of marijuana from going out into the hallway. Normally, a fan pointed out the window is used to pull a smell out of the room. This method is often used when individuals are trying to remove the smell of marijuana.
Bongs are devices that are used for smoking marijuana.
They may take many different shapes and forms. These items can be very decorative or homemade. Ones that are homemade can be made out of coke cans, paper towel rolls, and so on. Some are made of clear plastic or ceramic. The bottom of the bong often looks something like a vase except a bong has a tube sticking out near the bottom so the user can inhale smoke from the bong.