Investigating a case in 1989 was extremely troublesome. At the time, many technological methods were still underdeveloped. Even though Metropolis was one of the most advanced cities in the world, the number of surveillance cameras and dashcams here was less than 1% of what it would be after the twenty-first century.
As a result, most surveillance footage capable of providing direct clues only captured incidental details from the edges.
And because Metropolis had always been relatively safe, many cameras went unused, so no one bothered maintaining them. Lex had only recently taken over the Luthor family. He did not have the time to install cameras in every corner of Metropolis like Bruce had done in Gotham, much less spend even more time maintaining them.
This meant their investigative methods leaned more toward old-fashioned detective work: conducting field investigations, questioning witnesses, narrowing down the suspects, gathering them together for separate interviews, and finding clues in their testimonies.
While Bruce conducted on-site investigations at the three companies, Lex went to the Metropolis Police Department. From the surveillance room, he watched professional interrogators question the suspects.
They included three janitors, a bank employee, a Pyro Company gate guard, and a guard stationed near the bank president's villa. Together, these people included all the last witnesses as well as the first witnesses at the crime scenes.
The Metropolis Police Department was much more spacious and brightly lit. There were no mottled faded marks on its walls, and even the interrogation expert was relatively friendly. Using the professional knowledge he had learned in school, he repeatedly asked certain questions in sequence, prompting the interviewees to recall more details.
Lex sat with the Police Department Director in the surveillance room behind the interrogation area. He turned to him and said, "That damned murderer cost Luthor Corp