Immunity bars the use of a witness's compelled testimony in any subsequent prosecution of that witness.

USE would be the word filling that blank.

The full sentence is: Use immunity bars the use of a witness's compelled testimony in any subsequent prosecution of that witness.

Immunity, legal or from prosecution, is the legal status of an individual that cannot be considered liable for a violation of the law.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )

there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.