According to the Trade Metrology (the science of measurement) Act, bread could not weigh less than 5% of the declared quantity, or more than 10%.
Moeletsi said the government needed to ensure contravenors faced harsher prosecution through reviewing the act to close loopholes - which was currently happening - and should have their profits taken away, instead of being fined.
"At the moment, suppliers in contravention of the law only pay a fine, depending on the ruling by the magistrate."