corrupted officers will not want to see his bitcoins baught at $1200 and now fell at $500, corruption money does come easily, they risk their life for those money, so no bitcoin!
You're missing the point, of course they use Bitcoins, just like any other mean available to them. The error is the assumption of one particular amount of money being used for one particular purpose. If they were that transparent they'd have a hard time hiding their money.