I wasn't able to find an answer to this question - I got a FBI certificate in Feb 2017 because I lived in the US. However, if I travel back for a visit (for a wedding or short trip), do I need another FBI certificate? My understanding is that its only required for places one has "lived" 6 months or more but that would mean I can't travel to a place until my PR application is submitted?. This is rather confusing.