A leading question is one that suggests the answer.
Just asking a specific question is not leading.
- "Was the car green?" – OK
- "Isn't it true the car was green?" – Bad
- "And the car was green?" – Maybe
Leading questions are permitted in cross-examination or with hostile witnesses.
Leading questions are generally prohibited in direct examination but are allowed at the judge's discretion
as necessary to develop the witness’s testimony, usually for non-substantive things.
Objecting to leading questions is often stupid because they are so easy to fix.