text: [Themes: edutainment]
  
  You call Lauren's ex-boyfriend Michael in for questioning. He arrives shortly after and you open the interview by bringing records of his text messages to the table.
  
  "In this last message, you tell Lauren that you're on your way. Exactly where were you on your way to?" you question.
  
  "Her house. I never actually left though, I took two steps out the door before reevaluating my decision and going back inside. I was just upset she was moving on so fast, but what can you do. I'm getting over her, and deciding not to go talk to her was a big step for me." he admits.
  
  "Do you have an alibi? Anyone who can confirm what you're telling me is true?" you say.
  
  "No... my roommate was out of town visiting his family that weekend. I promise, I loved Lauren and would never hurt her. I want to catch whoever did this as much as you do!" he exclaims.
  
  "Mr. Underwood, tell me, do your parents still live on that farm by the Thames? Were they on vacation the weekend of the murder?" you taunt, catching him off guard. You know better than to come to an interrogation without doing background research.
  
  "Yes. What does that have to do with this case?" he argues.
  
  "A herbicide commonly used in corn farms was found on a fiber on Lauren's body. I'm sure you're very familiar with atrazine." you say, leaving Michael speechless.
  
  You stand up and collect your things, ready to give Chief Morrison your final verdict.
  
  > continue the investigation
  You decide that you shouldn't be too quick to convict Mr. Underwood and decide to call in Lauren's date, Ed Richards, for questioning. He arrives promptly and you get started right away.
  
  "Did you see Lauren Ross the night of the 27th?" you ask.
  
  "Yes. We went out to dinner and I called her a cab afterwards. That was the last I saw of her." he responds.
  
  "Well it seems that Ms. Ross was poisoned. With arsenic, to be specific. Traces of a herbicide called atrazine were found on fibers on her body. You live on a farm, don't you Mr. Richards?" you question.
  
  "Yes, I do. I didn't poison Lauren though, why would I? I have no motive. I had a nice dinner with her, and that's all. What happened afterwards is unknown to me." he expresses.
  
  You thank Mr. Richards for his time and decide to review your findings with Chief Morrison.
  
  > talk to Chief Morrison
  After speaking to Chief Morrison, you return to your office at home. You spend a few hours going over case details when you remember hearing about a new process called DNA phenotyping. You call Dr. Fischer and consult with him, agreeing that the lab does in fact have the ability to run the test.
  
  Half an hour later, you arrive at the lab.
  
  DNA phenotyping is the process of predicting an organism's phenotype using genetic information collected from DNA sequencing. By assessing ancestry-informative markers (AIMs), you can determine single-nucleotide polymorphisms (SNPs). SNPs are the most common type of genetic variation among people. Each SNP represents a difference in a single nucleotide (C9H13N4O10PS). AIMs are SNPs that exhibit substantially different frequencies between populations from different geographical regions. A collection of AIMs are then used to estimate the percentage of ancestry an individual derived from each region. This is then converted into code that is passed through complex algorithms to predict physical traits, reverse-engineering DNA into a physical profile. The final 3D face takes all genetic information into account for facial structure, geographic ancestry, and eye, skin, and hair color.
  
  Calculating the Chemical Formula of Oligonucleotides:
  
  An oligonucleotide is a short sequence of nucleotides, typically twenty base pairs. When the chemical formula is calculated, various properties can be derived from it. To calculate the formula, add the formulae of each base, then subtract PO3H (there is no phosphate linkage at the 3' end), and add H2 (both the 3'-end and 5'-end are protonated).
  
  Formula for Each Base:
  
  A: C10H12O5N5P
  
  G: C10H12O6N5P
  
  C: C9H12O6N3P
  
  T: C10H13O7N2P
  
  U: (C9H11O7N2P)
  
  STR profiling is a form of DNA sequencing, and you already have a partial STR profile from the analysis you did earlier. You use this profile to run a DNA phenotyping test and calculate a 3D model of a white male with a large amount of freckles. Immediately you can rule out Blake Russell and Michael Underwood, as none of them have freckles. Ed Richards, on the other hand, has a large amount of freckles and resembles the 3D model.
  
  You call Chief Morrison and inform him of your findings, and he tells you he is going to file for a warrant to search Ed's house and collect a DNA sample from him to run against our partial profile.
  
  > A few days later...
  A couple of days later, you receive a call from Chief Morrison telling you they have obtained the warrant. You and Constable Peterson drive to Ed's farm and ring the doorbell. A few moments later, he answers the door.
  
  "We have a warrant to search your property and collect a DNA sample from you," you say as you hand him the document.
  
  The color drains from his face and you begin to sense that you might be face to face with the Thames River Killer. Ed lets you and Constable Peterson inside and you pull out two glass slides and ask Ed to press both his right and left thumbs onto the slides for 3 seconds. You then store the slides in a closed, decontaminated box until it can be taken to the lab for analysis.
  
  You and Constable Peterson look around Ed's house, finding nothing.
  
  You suggest looking through the barn at the edge of the property. You are looking through toolboxes when suddenly you discover one of them contains three fingers. You motion to Constable Peterson, who understands and immediately arrests Mr. Richards.
  
  You call Chief Morrison to inform him of the arrest, and he congratulates you and tells you that he will send over a crime scene unit immediately.
  
  "Finally, this case is over and citizens don't have to live in fear," Constable Peterson declares.
  
  > A few months later...
  The Thames River killer case is completely wrapped up now. It was discovered that Mr. Richard's DNA and fingerprints matched those left at the scene of all three cases. The three fingers found in the barn matched each of the victims, and the jury convicted Mr. Richards with no hesitation. He is now serving three counts of life in prison. He truly did not have any of the principle motives - love, greed, or anger. He simply had a disturbed mind and killed for his own personal satisfaction. He lured victims to have a meal with him, which he poisoned and then severed the victim's ring finger as a trophy before dumping the body in the Thames River. He got too comfortable with the last victim, taking her to his own home. This ultimately led to his capture, as the atrazine found in the fibers gave you a big hint.
  
  You, Constable Peterson, Chief Morrison, and Dr. Fischer all go out to celebrate closing the case, toasting to keeping the peace in London.