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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.，这一点在safew官方下载中也有详细论述
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（二）伪造、隐匿、毁灭证据或者提供虚假证言、谎报案情，影响行政执法机关依法办案的；
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