As the Schengen area gets bigger, it becomes more difficult to police and this increases the risk of rogue elements being able to move freely between countries  As new members are accepted and the Schengen area expands, it becomes more and more difficult to police. For example, once terrorists have gained access to the area, they are free to move within almost the entirety of Europe. The same applies for traffickers of people, drugs and arms. This was the rationale behind the blocking of Romania and Bulgaria from entering the zone at the same time as they entered the EU [1] ; they failed to curb organised crime before their accession and if they were join access routes would be opened to the whole of Europe.  This means that all countries are dependent on the security forces of countries monitoring external borders. It is key that Member States with an external EU frontier have a responsibility to ensure that proper checks and effective surveillance are carried out at the EU's external frontiers. It is vital that checks and controls at the EU's external frontiers be rigorous enough to stop illegal immigration, drug smuggling and other unlawful activities [2] . Given the different enforcement abilities of different member states, the security of one state is often not protected because of the carelessness of another. Dissolving the Schengen area gives countries responsibility for the protection of their own borders and thus makes Europe safer as a whole.  [1] Kelly, Tom, ‘EU borders will stay shut to influx from Romania and Bulgaria over fears of crime flood’, The Daily Mail, 23rd December 2010,   [2] The Schengen Convention: Abolition of internal borders and creation of a single EU external frontier, eurotool,