2、有条件的刑事豁免制度
为保障卧底侦查的顺利进行，或为保护卧底人员自身或他人的生命健康安全，可以允许卧底人员实施一定的侵害法益的行为，对此不予追究其刑事责任，但不可侵害國家及公民的重大利益。
3、出庭作证豁免制度
在西方许多国家的法律中，明确规定了警察作为证人出庭作证的义务。我国刑诉法虽然对此未作明确规定，但根据最高人民检察院《
人民检察院刑事诉讼规则》第
343条的规定，公诉人对于搜查、勘验、检查等侦查活动中形成的笔录存在争议，需要负责侦查的人员以及搜查、勘验、检查等活动的见证人出庭陈述有关情况的，可以建议合议庭通知其出庭。这就肯定了警察在一定条件下负有出庭作证的义务。但对于卧底取证的案件而言，卧底警察出庭作证会暴露其真实身份，给其本人及亲属的人身财产安全带来威胁。因此，在一般情况下，应免除卧底警察出庭作证的义务,可允许其以录音、笔录等形式提供证言。
参考文献
[1]孙长永.. 侦查程序与人权保障[M]. 北京: 中国方正出版社. 2000，37.
[2]储槐植. 美国刑法[M]. 北京: 北京大学出版社,1996. 9.
[3]李昌珂. 德国刑事诉讼法典[M]. 北京：中国政法大学出版社, 1995. 38—40.
[4]卧底警官嫖娼被抓，开除公职妻离子散[N]. 北京晚报2002-17-7.
[5]龙宗智. 欺骗与刑事司法的道德界限[J]. 法学研究, 2002,(4).
On Spy-investigation and Its Regulation by the law
Feng Weiguo
(law department of Central Judicial Police Institute,Hebei,Baoding,071000,China )
Abstract: Spy-investigation is a special method different from normal investigation mode, which has remarkable effect in investigating and uncovering some cases such as organized crime and no-victim crime. However, if not be strictly regulated by the law, It will cause the ill-effect of spoiling legal system and infringe upon human rights. So It is urgent to make laws to regulate the operation of sky-investigation. There are three factors we should pay much attention to on the legislation of sky-investigation: First, we should establish the principle of legitimization in spy-investigation; Second, we should set up supervisory system in spy-investigation. Third, we should strengthen the protection of sky-investigator’s personal safety .
