Quote Originally Posted by RivalRedwing View Post
If you have a water drain on the base of your filter assembly would they be within rights to take, or ask you to take, a sample of fuel from it? suspect = yes
They would definitely be within their rights.
If you have a glass filter bowl, that is their first stop. If what they see looks suspect to them, they will require a sample, and they can take it by draining from the tank or by dipping it.
A quick look at my filter bowl was all that was needed three weeks ago.