Negotiability

I am confused about the meaning of and possible liabilities related to negotiable instruments. I want to prepare material to clarify questions and concerns.

What are the requirement necessary for the check to be a negotiable instrument?

1. What are the primary potential risks associated with dealing with negotiable instruments, and why?

If a PI's community involvement, the company has become the title sponsor for a local charity golf tournament. After the tournament and during the awards luncheon, PI will be presenting the charity beneficiary with a check for the proceeds from the day's activities. They want to present the check on an 18 in x 24 in cardboard.

Can this 18 in x 24 in cardboard check be a negotiable instrument? Why or why not?