OTTAWA—The federal ethics watchdog has concluded Justin Trudeau was not involved in a decision that saw Liberal MPs using their taxpayer-funded budgets to hire the services of a company run by one of the prime minister’s lifelong friends. In a letter to Trudeau, Mario Dion says he’s satisfied that the prime minister was not involved in the Liberal Research Bureau’s decision to enter into a contract with Data Sciences Inc., a company owned by Tom Pitfield. As a result, Dion says he has no reason to believe Trudeau acted in any way to improperly further Pitfield’s private interests. The ethics commissioner says an inquiry is not warranted and he will not pursue the matter any further. Conservative MP Michael Barrett had asked Dion to investigate after the Globe and Mail reported that most Liberal MPs were paying NGP VAN Inc. and Data Sciences Inc. to help them manage constituency casework. …