I don't know the details of Pakistani law, but it seems like it could be a clever judicial technique for fighting corruption or tax evasion in cases where it ca

I don't know the details of Pakistani law, but it seems like it could be a clever judicial technique for fighting corruption or tax evasion in cases where it cannot be directly proven. If you spend more money than you lawfully earn, then presumably the rest have to come from illegal activities (assuming no fortune)?