Drug detection technology helps correctional officials control the flow of contraband drug materials and paraphernalia. Authorities are allowed to search inmates, their personal belongings, their cells, and their workplaces; a telephone monitoring system is used for intelligence purposes; and frequent, random urinalysis is used to test inmates for drug use. Undetected smuggling and possession of drugs within a prison can lead to violence between inmates. Inmates have used unique methods to obtain narcotics; in one case, a prisoner's wife who worked in a clothing factory sewed narcotics into the seams of trousers that were fraudulently ordered by the inmate. In another case, prisoners managed to obtain automatic weapons, ammunition, a communication system, narcotics, and cash that was smuggled in through a Federal government contractor. Another popular smuggling route is through family member visits.