with national security threats, the Counter Terrorism Unit (CTU) was established. CTU officers are based at eight major Australian international airports and proactively intercept inbound and outbound passengers of national security interest. ABF officers of the Counter Terrorism Unit receive use of force training and are equipped with personal defensive equipment (PDE) including firearms. Detector dogs Australian Border Force breeds, trains and utilises detector dogs for the purposes of detecting prohibited and restricted goods on people, in products and in large areas. Such substances include illicit drugs, firearms, explosives, currency and tobacco. The detector dog program is based in a purpose-built facility in Melbourne, Victoria. Dogs are selectively bred and trained for at least seven months. Dogs are evaluated at 4, 6, 8, 10 and 12 months of age. 60 to 70 percent of dogs bred by Australian Border Force are put to work, with the remainder sold to the general public. Dogs which complete the training program are used by the Australian Federal Police, Department of Agriculture, State and territory police forces, correctional services, Seeing Eye Dogs Australia, Australian Defence Force and various undisclosed international agencies. Passenger profiling and watchlists The Australian Border Force uses a "big data" analysis ecosystem to monitor people and cargo entering and leaving Australia. This includes the use of machine learning capabilities across a range of analytical platforms that draw together multiple data sources to provide insights. The Central Movement Alert List (CMAL) is an electronic watch list, containing information about individuals who pose either an immigration or national security concern to the Australian Government as well as information on lost, stolen or fraudulent travel documents. CMAL comprises two databases, the Person Alert List (PAL) and the Document Alert List (DAL). The PAL database stores the biographical details of identities of concern and DAL is a list of lost, fraudulent or stolen travel documents. PAL records are categorised according to the reason for listing the identity—the alert reason code (ARC). There are 19 ARCs with each being categorised as high, medium, or low risk. Australian Members of Parliament have expressed concerns about the lack of systematic control over data input and maintenance of the Alert List, stating that Australian citizens and visitors may suffer inconvenience or harassment due to misinformation or incorrect information being entered into the system. The Australian Border Force receives Passenger Name Record data from airlines operating into and out of