Schools in Brazil have started to implant microchips in students' uniforms since late March in an attempt to keep track of students and cut down on school truancy. 　　About 20,000 pupils in the northeastern city of Vitoria da Conquista now have locator chips embedded in their school T-shirts. 　　The chips, placed underneath the uniform badge, or on a sleeve, send a mobile phone text message to parents when a student passes through sensors at the school entrance. 　　If the students are more than 20 minutes late for class, their families are alerted with the message which indicates, "Your child has still not arrived at school." 　　And it does seem to be working. In the first two weeks of the scheme, truancy levels in this particular school have fallen from ten percent to nearly zero. 　　The so-called "intelligent uniform" requires no special care, and can be washed and ironed. For Sidilane Lopes de Souza, who looks after five children, including her nephew David, it's a great idea. 　　"This technology is so advanced. It is wonderful for parents. Knowing that your child has gone to school brings us comfort," de Souza said. 　　However, students show different reactions to the new uniforms. 　　One boy said that the chip makes him feel safe in school, while others said that they feel being monitored. 　　The local government has invested nearly 700,000 U.S. dollars in getting the system work. By 2013, all of the city's 43,000 schoolchildren aged 4-14 will be using the chip-embedded T-shirts.