That is correct, you cannot cross into Canada with leeches or minnows. Why? I can tell you why as I am a leech trapper in Wisconsin. The Canadian government decided that they didn’t want to introduce any disease or foreign species into their waters. That’s called political posturing. THE REAL TRUTH! They want to force you to buy leeches in Canada for double the price and half the quality. What a scam, think about it. A leech is swimming along a stream or lake. When they get to the Canadian border, they say to themselves, ” I have to turn around because I’m not allowed in Canada”. Also, night crawlers have to be in bedding. Just where does the soil that the crawlers flats are packed in come from? You guessed it, CANADA! I sell leeches from Wisconsin to a fellow who sells them legally to a dealer based in? You guessed it, Canada.