 In "Harris", one of the major points raised by a number of the "amici curiae" is that a dog's training or certification does not necessarily reflect that dog's reliability in the field.They point to what they say are "the most comprehensive data available on the rate of false alerts in real-world settings" – several years' of studies undertaken by an independent government agency in Sydney, Australia, under the Police Powers (Drug Detection Dogs) Act 2001.Police dogs went through an initial 6 weeks of training to detect cannabis, ecstasy, methamphetamine, cocaine and heroin, received additional training weekly, and were tested and re-certified every three months.