The hunter is violating the Lacey Act by attempting to bring the illegally killed wolf's skull across state lines.
The hunter is violating the Lacey Act. The Lacey Act is a comprehensive wildlife law that prohibits the transport and trade of illegally captured wildlife across state lines in the United States. In this case, the hunter's attempt to bring the wolf's skull from Yellowstone National Park to Florida would be a violation of this act as the wolf was illegally killed within the park.
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