Well here is some things to do.
0. Remember, there is people who is not to, freindly about drugs. This person might be one of those people. You can try to write them back. Maybe they feel you smoking a stogey is wrong. Then it might be a pun for something else you are smoking.
A. I highly suggest you install cameras in your truck. Like a small hidden one, in the front, and towards the side. Maybe like those new ones you see in offices. They got one looking at all the secretaries, peeking threw the tiny hole in the wall. With todays, small computers you could install a camera, and power it with your lighter.
1. Put the not in a plastic bag. The note might have finger prints ( aside your own ). Then when your ready. Go to the cops, with the note. Make sure to ask
A. Could you get finger prints from this note?
B. Will you arest me for had using a stogey???
2. LOOK. Look at the hand writing. Remember, differnt hand writings, means differnt things. Most people writing is leaned to the left. While some peoples hand writing is leaned to the right. It is part of personalities. I was told peoples hand writing that leans to left, means they are not a good person.
While I disbelieve all of that, you should look into it.
3. The note clearly states the person, who wrote the letter. "Mr. Guy that wears black and works at the callcente" so you might want to question this person. Maybe it was another person in the area......a complement from a guy