Prosecutors have a binary choice, to charge or not, he didn't charge. Nuff said.
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Mr Mueller was an investigator. As an investigator, he was charged with writing a report which can be exculpatory or not; consider it tantamount to a police report with the added ability to prosecute federal crimes arising from the investigation under (b) (i), (ii), or (iii).
See:
Rod Rosenstein’s Letter Appointing Mueller Special Counsel
So you admit he WAS as prosecutor, now you can STFU. The report was to contain his decisions to prosecute or not, nothing else. Read the ******* law.
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I posted the document, you're either a LIAR or too dumb to comprehend the written word.
Of course he was given the authority to investigate federal crimes, which he did and in which he prosecuted and either convicted or received guilty pleas to six former Trump advisers.
Maybe there is someone who can help you read the appointment letter.
So Mueller had the authority to indict. Why didn't Mueller put in his report that Trump obstructed Justice and committed other crimes?
Because (how out of touch are you?) the U.S. Justice Department has a decades-old policy that a sitting president cannot be indicted, indicating that criminal charges against Trump would be unlikely, according to legal experts.
However, The Supreme Court will be the final arbitrator, since the issue is not mentioned in COTUS; I doubt that the SC will put a POTUS above the law. If so, a bloodless coup will destroy the fabric of our country's jurisprudence.