Criminal Code (Cap. 9), article 559

559. For the purpose of any inquiry relating to the " in genere " or in the case of any " repertus ", there shall be brought or summoned to attend on the spot qualified persons in any art or trade who may be competent to ascertain the traces left by the offence, the condition and particulars of the permanent fact, the material m eans by which probably the offence was committed, the effects produc ed by the offence, the further effect s which the offence might pro duce, and their prob able duration. Employment of experts.