Drug Free Puns

To give a little background: My dad was a truck driver at the time, and he never saw something on the side of the road or that had a "free" sign on it that he could drive by without at least taking a look. My brother in law was a sheriff's deputy. He told this joke to my neighbor, I will try to do it justice.

My dad, his dispatcher(DIS), and lady neighbor(LN) are outside talking and it goes something like this:

Dad: Ugh, What a f--king week. I can not believe it.

LN: What happened?

Dad: I was in Georgia and I saw this cooler in the far corner of the rest area, just as you're about to leave. I looked around and I didn't see anyone... So I figured someone had forgotten it on their picnic... It was a nice ass cooler too. Igloo brand with the heavy duty wheels. It was beautiful.

LN: Let me guess, you took it and the food that was in it?

Dad: Oh god I wish, It was a nice cooler. So, I go over and I'm still looking around in case the owners are still there. So I get to the cooler and I'm thinking "jackpot." The outside looks amazing. So, I go to open it up to see if whatever is inside is salvageable or if i needed to throw it out. I open it up and I jumped back and screamed.

LN: What was in it?

Dad: FEET. HUMAN FEET. I'm thinking what the hell did I just stu...

LN: NU-UH, ARE YOU SERIOUS?!?!?!

Dad: YES I'M SERIOUS.. So by this time, I'm seriously freaking out and I have no clue what to do. I nearly passed the f--k out. I had no idea what I should do.

LN: (with her hands over her mouth in horror) OMG, WHAT DID YOU DO?

Dad: Well, you know my son-in-law is a police officer in Florida..

LN: mmhmm

Dad: Well, I didn't know what to do so I called him.

LN: What did he tell you to do?!

Dad: Call a tow truck.

LN: ....what?

Dad: Get it, toe truck?!

LN: YOU'RE SUCH AN ASS. OMG I HATE YOU.

DIS: Oh, look at that, M*****, I just got word from the office that you're up for this month's random drug test.

Edit: Formatting errors, sorry guys!

I would think of one but things just aren't adding up in my head.

Okay there is my terrible attempt , but having a small contest at my office involving being drug free. We are a math department so math involved in the pun would be a huge plus. (See what I did there), thanks guys any suggestions would be a great addition to mine .