Answer:
any time they have probable cause
Explanation:
According to my research on law enforcement techniques, I can say that based on the information provided within the question law enforcement is able to use this technique any time they have probable cause. If the law enforcement team can prove probable cause to the judge, then the judge will easily grant the warrant to intercept the wire communications.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.