i am from iowa (20 min from nebraska) the law states that it is illegal to sell not own a turtle under 4 inches. and no there is no law against keeping a turtle only large wild mammals. here is one of the care sheets i had on my computer. the rule of thumb is 10 gallons of water per square inch so if your turtle is 2 inches it needs a 20 gall tank. 3in=30gall.