Online it says if you are Canadian then you will be allowed in but may be fined $3000 a day and may be taken to a quarantine facility. I wouldn't chance it but its your choice. There are thousands of places to be tested in the states, just Google it.
Pesach after the seder, an older couple with their 3 teen kids were stopped. When questioned, the man said, it's lail shamurim, while the wife and 3 kids walked off. Then he took out his exemption card. The officer said, this is bullsh*t, go home.