In cases concerning infringement of the principle of equal treatment in employment, the principle of reversal of the burden of proof applies. This means that the burden of proving that there has been no breach of the principle of equal treatment lies with the employer. The employee only needs to substantiate their claim that the principle of equal treatment has been breached. Thus, if an employee presents facts which substantiate the accusation of unequal treatment, then the employer must demonstrate that no violation occured.