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The statement is true because the plants poison ivy, poison oak, and poison sumac contain an oil called urushiol, which is responsible for the allergic reactions associated with these plants. When a person comes into contact with the leaves, stems, or roots of these plants, the urushiol can transfer to the skin, leading to an allergic reaction that manifests as a rash, itching, and blisters.

Furthermore, urushiol can remain potent and cause allergic reactions long after the plant is removed. It can adhere to clothing, tools, pets, and even surfaces that have been in contact with the plants, posing a risk of spreading the oil to other areas or individuals. For instance, if someone touches clothing or gear that has urushiol on it and then later touches their skin, they could trigger a reaction.

Thus, it's vital to take precautions after exposure to these plants by thoroughly washing skin and any potentially contaminated items to prevent the spread of the oil and subsequent allergic reactions.