Manix paid the local district attorney $ 1,500 a month for a year not to prosecute him

Question:

Manix paid the local district attorney $ 1,500 a month for a year not to prosecute him for operating an illegal gambling establishment. Manix then decided to quit the business. He now seeks to recover the money paid to the district attorney on the grounds that his payment over the year amounted to a bribe and was therefore illegal. Can Manix recover the money?