Nowadays, many people are trying to find shortcuts to earning money.
The Indian government has recently imposed a number of restrictions on the import of gold, but has exempted certain people who may carry up to 1 kg gold with them across the border by only paying the duty. Many businesses, in order to get around these restrictions, elect to use individuals to carry gold for them one kilogram at a time, and pay them for their service.
In Islam, is it permissible for these people (the ones who carry the gold) to earn a profit in such a way?