In some parts of the world, bribe (or gratuities, perhaps) are normal.
Just seems to me that sometimes, bribes are what gets things done in some parts. I knew a field service type, who when he went into certain places had to pay a "gratuity" to get his tools through customs. Parts had to have a "handling fee" paid. In all cases, the fees disappeared into the custom's guys pocket. I guess it's one of "amount of money" or "ensuring the contract with no problems" that creates the legal problem....