Private funding of Interpol: another slam to credibility

It has recently come to light that Interpol has begun to receive funding from major corporations. Industries from tobacco to pharmaceuticals have made agreements with the international police organisation over the past 5 years, boosting Interpol's budget, but calling into question the nature of these agreements, and indeed, the integrity of Interpol itself; particularly in regards to cases of financial crimes, corruption, intellectual property infringement, and the like.

We have seen a marked increase in the use of Interpol as a mechanism for pursuing private matters between lenders and allegedly defaulting clients, as well as cases involving patent and trademark disputes. When Interpol is receiving corporate funding, and when the nature of the deals between Interpol and its corporate sponsors are not transparent, what is the guarantee that such matters will be handled impartially?