The information is called the "fruit of the poisonous tree" because it will be used to prosecute her.
A "fruit of the poisonous tree" refers to any evidence gathered by police from the offender that violates a his constitutional rights.
Here, Zoey is accused of auto theft and she refuses to give information because such information will be used to judge her.
In conclusion, such information is called the "fruit of the poisonous tree".
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