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Once species jump continents or mountain ranges, isn't it a losing battle? Does making hikers wipe their feet really help? The deer and the raccoons are not going to cooperate. Does spraying down your boat prevent zebra mussel infestation of lake, when there are thousands of ducks landing and taking off. Maybe slowing down the spread gives an eco system time to adjust, but I doubt you can stop invasive species if their a niche to fill.