Hi there, 

I have a caution from 2013 for D&D and assaulting a police officer. It was a simple spent caution. I believe it is now filtered under the ROA here but I tried to apply for an Esta for the States online once and can't remember what the question was but they immediately refused my application and I never took it any further. If I now want to travel to Canada should/could I a) just answer no on their online form and hope that they don't share info with the states? My worry is that although I didn't take it further there is now a permanent mark against my name on their system or should I be honest and again risk a ban?