In an effort to catch criminals and kidnappers, Mexico plans to start a national register of all mobile phone users. Under a new law published today, mobile phone companies will have a year to build up a database of their customers, complete with fingerprints. The law is due to be in force in April. Sadly, hundreds of people are kidnapped in Mexico each year. As the army cracks down on drug gangs, these gangs are increasingly using kidnappings as a source of income, causing the number of kidnappings to increase.