It's definitely possible to make drugs that are "race targeted". They won't be 100% accurate, but if 23 and Me can do a Race Science on you with just your spit (and it's pretty accurate from my family's results), they can make diseases too.
That being said, it's a moot point because most Chinese people in Canada are either not from the PRC or left the PRC because they're rich and needed a safe place to park their money (and Canada is very easy to move to if you're rich). There's 0.0% chance that they would be an effective sleeper cell.
It's definitely possible to make drugs that are "race targeted". They won't be 100% accurate, but if 23 and Me can do a Race Science on you with just your spit (and it's pretty accurate from my family's results), they can make diseases too.
That being said, it's a moot point because most Chinese people in Canada are either not from the PRC or left the PRC because they're rich and needed a safe place to park their money (and Canada is very easy to move to if you're rich). There's 0.0% chance that they would be an effective sleeper cell.