On 18th November 2021, the German Parliament passed the "Act Amending the Protection against Infection Act and other Laws on the occasion of the Repeal of the Determination of the Epidemic Situation of National Significance." The Act obliges employers, with regards to § 28b para. 2 Sentence 1 IfSG, to monitor compliance with the “3G rules” in the workplace. At first glance, this obligation does not suggest any major difficulties, since simple entry checks can theoretically be carried out. However, on a closer look, as is so often the case, data protection problems arise.