Great Qs–and incredibly timely! The answer is NO and NO.
Standard Definition: There are a lot of experts out there, including some of our OHSI advisors, calling on the federal govt. to adopt a standardized definition of safety-sensitive positions. But unless and until that happens–and it probably will–the standard definition is something in the order of a position requiring a high degree of care and safety and which becomes highly dangerous when done by a person who’s impaired.
Official Lists: I’m aware of no Canadian jurisdiction that has compiled a list of safety-sensitive positions. But in the US, one agency has–Connecticut OSHA. The list is pretty comprehensive and I think you can rely on it. https://www.ctdol.state.ct.us/wgwkstnd/highrisk.htm
Hope that helps. Glenn