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How to buy a ferret 
Check legal requirements and state regulations. 
In some countries, owning a ferret as a pet is illegal. Most states in the united states permit ferret ownership, however in some states, such as california and hawaii, do not.
Other states, such as rhode island, require you to acquire a permit for owning a ferret. Check with your local police department or other state animal control agencies to make sure you are following all laws when it comes to ferret ownership.