How can governments prevent ISIS from entering their countries while at the same time allowing refugees from the Syrian Civil War in?

Answer 1

Later this month, the UN General Assembly is going to meet to discuss this safe Immigration, which concerns everyone. Current resettlement policies are stringent, requiring two to three years of examination. Refugees do not have a choice as to where they will be sent. The people coming in now to the US and other places have been in pipeline for several years already. Many more thousands have recently left Syria, and the concern is to have the same stringent vetting as well as acting in a timely manner. This is a difficult situation, since not only are these people fleeing a dangerous, war torn, area, but they are having to start their lives anew in a strange place, where many people are suspicious of them due to their ethnicity.

Answer 2

Simply put, there is no way to completely remove the risk of Jihadists infiltrating the migrant population, but you can substantially lower the likelihood that this will happen by creating a vetting process that can establish with reasonable certainty what the intentions of the migrants are.

The vetting system used by the United States to determine refugee status and asylum requests is one of the most stringent in the developed world and a model policy for other countries to look at. It requires written submissions to the United Nations High Commissioner for Refugees and interviews with its personnel. If they are approved by UNHCR, the candidates are interviewed and vetted by the FBI National Counterterrorism Center, the Department of State, the Department of Defense, and the Department of Homeland Security. Fingerprints are taken, biographical information is collected, and each migrant is individually interviewed by U.S. officials trained to verify their particular stories of abuse and flight as well as to verify that they're bona fide refugees (and not economic migrants, intending to cause terrorism/distress, or Non-Syrians who have just destroyed their documents). All of the vetting occurs while the migrant is still outside of US territory and takes 1-4 years.

Compare this to Germany's open invitation to anyone claiming to be a refugee. Such a policy allows anyone to effectively become a "Syrian refugee" and leads to numerous people who are not Syrians and not refugees to take advantage of the kindness.