503. In proceedings for a contravention of this Code, the court may accept, in lieu of the testimony of the peace officer who reported the infraction, a written report signed by the peace officer, in the form approved by the Government. If the original of the written report is in the hands of the Attorney General, a true copy certified by a person designated by the Attorney General of by a person acting under the authority of the designated person may be substituted for it.
However, the defendant may require the presence of the peace officer at the hearing, and the court, if it finds the contravener guilty, may condemn him to additional costs in such amount as it may fix if, in its opinion, the mere filing of the report would have sufficed.