Criminal evidence

[Criminal Investigation] 1983.There is no Skynet, no fingerprint comparison system, no face recognition system, no perfect identity verification and statistics system, and even a blood type DNA identification requires a six-hour train ride to the provincial capital, queuing up to get the number and find an expert. In the era when the report has to wait another seven or eight days to get the result, how should we solve a major criminal investigation case?Lu Qinghe looked at the stack of documents on his desk and said. "What can I do, let's compare it manually." I heard that a new criminal investigation expert has come to the bureau, and he has studied abroad.What Lu Qinghe looked down on the most in his life was the person who opened his mouth and shut up hello, OK, but one morning when he opened the door, he saw this expert who had returned from abroad coming out from the opposite door, and he just opened his mouth and said. "Good morning!" The expert ignored him, rolled his eyes, and took away the Phoenix bicycle leaning against the wall.Lu Qinghe took a bite of the white steamed bun in his hand, and he chased after him and shouted, "Shen Changyan, wait for me, my tire blew up yesterday, you can give me a ride." With an aura of studying abroad and professional knowledge of criminal investigation, Shen Changyan died as soon as he started his job With the title of criminal investigation captain, he is originally a high-level talent and an intellectual, but there is one person in the criminal investigation detachment who doesn't like his knowledge and qualifications. He always secretly calls him "little foreign devil". Heard rumors. "You mean the captain of the criminal investigation? Just Shen Changyan, that girl and my childhood sweetheart." One night, when Lu Qinghe came home from get off work, when he was passing by the opposite door with no street lights, he suddenly heard someone asking him. "I heard that someone is looking for a bamboo horse. Is it you? Lu Qingmei." Lu Qinghe's head was full of question marks, "Who the hell is Lu Qingmei, my name is Lu Qinghe." : Protagonist: Shen Changyan, Lu Qinghe┃ Supporting role: