(1) If, on the trial of a person for theft or for unlawfully obtaining property otherwise, it is proved that the person handled or possessed the property in such circumstances as to constitute an offence under section 17 or 18, he or she may be convicted of that offence.

(2) If, on the trial of a person for an offence under section 17 or 18 of handling or possessing stolen or otherwise unlawfully obtained property, it is proved that the person stole or otherwise unlawfully obtained the property, he or she may be convicted of the theft of the property or of the offence consisting of unlawfully obtaining the property.