As to the first question, Constanzia, I have yet to find, in recent research, a species that is reputed to have poisonous berries. On the other hand, the berries of many species contain varying amounts of an alkaloid called berberidine. That is medicinal in small amounts, and--as usual--poisonous in large concentrations. Probably worth caution with species not mentioned in recipes!
The answer to the second question is "Nope!" B. canadensis is native to the region. On the other hand, B. thunbergii is becoming invasive there.