The practice of concealing cocaine or other drugs inside one's body (either by swallowing or inserting the drug) to avoid police or border authority detection is a smuggling attempt known as body packing.
Methadone doesn't lessen the severity of drug addiction and dependence, and use of the drug in any type of treatment environment leaves the addict completely dependent on and addicted to methadone instead of other opiates they were formerly addicted to.
The top Ecstasy side-effects reported are difficulty concentrating, jaw clenching, grinding of the teeth during sleep, lack of appetite, and dry mouth/thirst.
Most specialized drug rehab programs employ counselors, physicians, nurses, and access to social workers to aid in the rehabilitation process.