由於通訊監察對於人民隱私的侵害極為強烈及廣泛，又係以秘密方式進行，是故，最小侵害原則為通訊監察法制中的重要程序規範。司法院釋字第 631 號解釋更是明確指出，此一原則屬於通訊監察執行時所應遵守的憲法誡命。在判斷通訊監察是否合於最小侵害的要求時，應綜合個案中的具體情狀，從客觀面審查執行官員是否已盡到善意合理的努力，以最小化對於與本案無關聯之通訊的侵害。違反最小侵害原則時，應有證據排除法則的適用，如此方能確保執法機關會嚴守相關程序規範。就執行面來說，執法官員可採間續性監察的方式，以減少對於監察對象及無辜第三人的影響。

Communication surveillance conducted surreptitiously results in wide and
severe invasion to people’s privacy so the minimization requirement is a
materially important procedural rule in the communication law. J.Y.
Interpretation No. 631 clearly indicated that the minimization requirement
constitutionally governs the execution of communication surveillance. When
determining whether communication surveillance complies with the minimization requirement, courts should consider the totalities of the circumstance to decide whether the law enforcement makes good-faith efforts to minimize the intrusion to nonpertinent communications. In order to ensure the police’s compliance with the minimization requirement, communications obtained by wiretapping violating that requirement should be excluded. Law enforcement officers may adopt spot-monitoring which is able to efficiently lower intrusion to targets and innocent third parties.