Judge to be satisfied

186(1) An authorization under this section may be given if the judge to whom the application is made is satisfied (a) that it would be in the best interests of the administration of justice to do so; and (b) that other investigative procedures have been tried and have failed, other investigative procedures are unlikely to succeed or the urgency of the matter is such that it would be impractical to carry out the investigation of the offence using only other investigative procedures.