Here is what I was reading (instructions for the 50cc including both the 1000/24 and 1500/36).
"... find at least one police officer, firefighter, judge, notary public or authorized Iron Butt Association member
... You may fill out the witness section with the Police Station/Fire House address.
Ask the officer to supply his badge number and note it on the witness form.
... Generally speaking,
you will need to find one police officer at both the start and end of your ride to witness the date, time and location.
..."
http://www.ironbutt.com/ridecerts/ge...nt.cfm?DocID=4