Characteristics of evidence:
Must be
Sufficient - It must be persuasive enough to convince a reasonable person of the validity of the findings. Means also that it cannot be easily doubted.
Reliable / Competent - It must be consistent with fact, must be factual and not circumstantial.
Relevant - It must have a reasonable and sensible relationship to the findings.
Legally permissible - It was obtained in a legal way.

Enticement <-> Entrapment:
Enticement -
Is legal and ethical.
Entrapment -
Is neither legal nor ethical.

Phone Phreakers
Blue boxing - A device that simulates a tone that tricks the telephone company's system into thinking the user is authorized for long distance service, which enables him to make the call.
Red boxes - Simulates the sound of coins being dropped into a payphone.
Black boxes - Manipulates the line voltage to receive a toll-free call.