I did a ride along with a kyfw officer and he gave me some excellent advice. He told me "I always know the answer to the question that I am about to ask someone." He went on to tell me if he sees people on the river bank he dont just stroll up on them without watching them from a distance to see exactly what they are doing. He will watch the individuals actions to get a feel about who may cause him problems and how many people there really are and what they are actually doing. So generally if a CO rolls up on you they know already what you are doing and lying to them only makes it 100 times worse.