The sister of an ex-girlfriend of mine has contacted me after 18 months of not hearing from them and told me that she contacted immigration in Canada to tell them of an incident with my ex girlfriend and that I'm now flagged and will be in immediate trouble when I get to Canada. Can this happen? I have no criminal record and the incident wasn't as my ex has told people it was. Would they contact me to inform me I've been flagged? Would they check my criminal record or will they pull me in and ask me my side of the story when I arrive? Can anybody put my mind at ease? I'm hoping they don't take psycho ex girlfriend's sisters seriously when they call up with accusations in the hope of getting someone refused entry, but thought I'd ask.