Questions: This doctrine established that evidence obtained as the result of an earlier illegality, must be excluded from trial. Example: evidence discovered illegally cannot be used to discover other evidence? illegal search doctrine exclusionary doctrine fruit of the poisonous tree doctrine bad search doctrine

The answer is: fruit of the poisonous tree doctrine.

Explanation for each option:

1. Illegal search doctrine: This is not a recognized legal doctrine. While it might refer to the concept of evidence obtained through illegal searches, it is not the specific term used in legal contexts.

2. Exclusionary doctrine: This is a partial answer. The exclusionary rule is a legal principle that excludes evidence obtained in violation of a defendant's constitutional rights. However, it does not specifically address the issue of evidence derived from illegally obtained evidence.

3. Fruit of the poisonous tree doctrine: This is the correct answer. This legal doctrine extends the exclusionary rule to evidence that is indirectly obtained as a result of an illegal search or seizure. It means that not only the evidence obtained directly from the illegal act is excluded, but also any additional evidence discovered as a result of the initial illegality.

4. Bad search doctrine: This is not a recognized legal term. It might imply evidence obtained from a flawed search, but it is not the specific term used in legal contexts.

In summary, the "fruit of the poisonous tree doctrine" is the established legal principle that requires the exclusion of evidence obtained as a result of an earlier illegality.