Quagga mussels
Quagga mussels are shown in this undated photo by the Arizona Game and Fish Department. Rep. Nancy McLain, R-Bullhead City, is sponsoring legislation intended to curb the spread of quagga mussels and other aquatic invasive species by, among other things, authorizing checkpoints and inspections to ensure that watercraft carrying them.  George Andrejko/Arizona Game and Fish Department

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