In groups chose the questions with expressions you wish to practice and discuss - then in different groups try to recall the key phrases and expressions you used 

Who were the victims?
Were the victims friends, or minors?  
Where did the murders occur? 
What was the murder weapon?
What did the investigation team find?
What is the issue with trash evidence?
How did the police get inculpatory evidence regarding the car, the DNA? 
For the private company to make the DNA database accessible to the police investigation do they need the consent of the client for the evidence obtained to be admissible?
Who are the persons not suspected of being involved in the criminal offence?

Here are some comprehension questions based on the provided case:
1. When did Goncalves and Mogen go out to the Corner Club bar in Moscow?
2. Where did Chapin and Kernodle go on Saturday night?
3. What time did Goncalves and Mogen return home on the night of the incident?
4. What is the estimated time frame during which the murders are believed to have occurred?
5. Describe the roommate's experience when she heard someone in the house during the incident.
6. Can you provide a description of the man the roommate saw during the incident?
7. What did the security camera record at approximately 4:17 a.m.?
8. How and when were the four victims discovered?
9. What did authorities notice about the suspect's vehicle in the surveillance video?
10. What evidence did the police find on a victim's bed related to the suspect?
11. How did the police plan to identify the suspect using DNA evidence?
12. What technique did the police use to cross-check the unidentified DNA evidence?
13. What did the police discover after cross-checking the DNA evidence with the white Elantra owners?
14. Why were the surviving roommates considered "guilty" of irrational behavior?
15. Why were the police criticized for not acting speedily in the investigation?

How are the following expressions related to the case and can you make sentences about the case using the expressions? 
1. Suspect
2. Witness affidavit
3. Autopsies
4. Official report
5. Toxic substances
6. DNA evidence
7. Genetic genealogy
8. Public database
9. Law enforcement
10. Investigation
11. Prosecution
12. Tip line
13. Cross-check
14. Searchable state databases
15. Crime scene
16. Surveillance video
17. Integrity of the investigation
18. Account of events 
19. Contradictory testimony 
20. Direct evidence
22. Circumstantial evidence 
23. Undisputed case 
24. Rebuttal 
25. Especially cruel and and heinous crime (manner of killing)