When a contractor applies for a public tender in Poland, they are required to show that there are no grounds for excluding them from the procedure. One cause of exclusion is legally binding conviction of a contractor (natural person), or persons vital to the contractor’s business activity, for certain offences. Persons key to the business are usually management board or supervisory board members in the case of capital companies, partners in the case of partnerships, and commercial proxies. According to the specific circumstances, this problem might also affect a firm that makes resources available to a contractor.