Electronic passports

If people are concerned about the location of Western converts fighting for ISIS, then all nations should make electronic passports complete with GPS transponders.  Cell phones cost almost as much as a passport these days so it is economically viable. 

Electronic passports have many advantages:

• Easy to find someone lost in a foreign land. 
• Easy to track if people went into a dangerous country. 
• Easier to track drug mules.
• Easy to estimate how many foreigners are in a country.
• Easy to determine when and where someone was kidnapped. 

 It's defeatable, but it makes things easier.

Technology can help lots of problems if people can conceive it.