John H. answered 08/22/19
Certified Criminal Justice Instructor with 20+ years of experience
The response here will vary upon different variables. It sounds like you are talking about whether the police can use triangulation to pinpoint an individual's precise location after a crime has been committed. The answer is yes and no. If the case involves a serious situation where someone's life is in grave danger, for example, a kidnapping just took place, and witnesses saw a man tie up a young child and toss her in the trunk. The police would be able to put out a be on the lookout with a description of the information they have. In this instance, a detective could contact the law enforcement section of a cell provider and request and emergency warrant. This would authorize the cell company to utilize triangulation to follow the suspect. Triangulation can pinpoint one's location within a three block radius by bouncing signals off of three separate cell towers (hence, triangulation). In this case, the emergency information would need to be followed up with a search warrant. Another example is if during an investigation, a cell phone becomes an item of interest. Let's say you had been texting or calling someone during the commission of a crime. While investigating the crime, I come across your phone number. I could request a special subpoena where a judge would hear the reason I need to access your phone records. If the judge finds there is a need, they will grant access. I, as the detective would then contact the cell company, send over the court order, and at that time, I would be able to access all kinds of information, including your call history which lists times and locations. Now, let's say these records make you an important person of interest. I could then apply for a search warrant to get your triangulation information which might put you at the scene of the crime. See, there's really no easy way to explain it, but I hope that answered your question.