I didn’t know you could withhold evidence during a criminal investigation? This is new to me.
BUT, if a judge subpoenas that information you better give it up or face more sever charges.
at least that is my take on it.
Journalists are above the law.
You don’t have to comply with a law enforcement request of anything beyond your identity unless the information is subpoenaed, and then you have to answer the subpoena, not necessarily give up the information although that is the typical consequence.