Tim said that while the parcels looked harmless substances were hidden inside the contents.He warned students against accepting offers that they might see on social networking sites or receive via text message.They've got general goods inside them,but within those goods are concealed substances such as ephedrine,which are used to make illegal drugs. Tim told broadcaster ABC. "The syndicates often tell students that because of their age, they won't be held legally responsible,but that is completely incorrect