CIC News obtained a copy of CBSA internal memo which explained how officers at POE determine what essential travel is
https://www.cicnews.com/2020/05/how-cbsa-determines-essential-travel-revealed-in-internal-memo-0514463.html#gs.7i893z
https://www.cicnews.com/2020/05/how-cbsa-determines-essential-travel-revealed-in-internal-memo-0514463.html#gs.7i893z