in advance, e.g. with youth organisations. The social media platform Twitter was also used for the first time. The criticisms voiced by the NPM were not nearly as serious as in previous years and raise the hope that there has been a change of strategy. Apparently, the strategic analysis of the less-than-optimal police operation in 2014 made sense and was expedient in implementing the police operation in 2015. The Federal Ministry of the Interior expressed its understanding of many points of criticism (addressing persons disrespectfully, delay in the removal of handcuffs, a lack of notification to pedestrians of any barriers) and promised additional efforts to improve the course of future operations. Ongoing observation and participation by the commissions in operations will show whether permanent structural improvements have been made. There were problems with detainees who were restrained with cable ties because these restraints could not be loosened for a long time and only after many attempts. As a result of this criticism, the Federal Ministry of the Interior announced that side-cutting pliers will be brought along in the future to cut cable ties. The NPM criticised that some ball attendees were brought to the ball by the police in police vehicles. In the opinion of the NPM, it is the task of the police to enable ball attendees to arrive safely, but not to transport them.  The 3 D strategy and the communication strategy should be continued and implemented on an ongoing basis. 2.7.3. Individual cases 2.7.3.1. Visit to GREKO Schwechat In 2012 a commission visited the GREKO detention rooms at Vienna International Airport Schwechat and discovered defects and potential hazards, such as a large metal hook that jutted out from the wall and a metal trash can with sharp edges. Moreover, no daylight entered the detention rooms, and there was no call bell to contact the guards if necessary. Dangerous detention rooms The potential hazards were promptly eliminated. With other defects, a joint effort with the airport was necessary, which took a long period of time. In April of this year, the NPM was informed that most of the defects had been eliminated. The remaining structural changes that had to be made would be undertaken within the next few months. The commission will monitor the implementation of the adaptation measures in a follow-up visit. Elimination of defects 152