Intermittent faults were among the most difficult problems in systems engineering. A device could pass every routine inspection and still fail under a rare combination of conditions. A connection could appear stable until a particular hardware state, software sequence, or environmental factor exposed a weakness.
But the woman's next sentence disturbed him.
"Some of those failures happened right after officers tried to access information they weren't authorized to view."
The engineer stopped writing.
"Are you certain?"
"No. That's exactly why I'm calling you instead of making accusations."
He appreciated the distinction.
She continued.
"I kept some of my old shift notes. Nothing confidential, just dates and descriptions of equipment problems I reported through the proper channels. I thought somebody should compare them with the maintenance records."
The engineer looked toward the diagnostic terminal resting on its charging stand.
The device had become an object of public fascination after the traffic stop. News reports had exaggerated its capabilities, with some commentators claiming he possessed a secret ability to disable police vehicles anywhere in the city.
He had repeatedly explained that the terminal did nothing of the sort.
Unit 44 had already entered a fault condition. The protected network had isolated a compromised communications gateway according to established safety procedures. The engineer had acknowledged the incident and preserved the relevant diagnostic information.
There had been no personal command that shut down the city's emergency communications.
No hidden revenge mechanism.
No dangerous interruption of the broader police dispatch network.
But the retired dispatcher's description suggested a question worth asking.
Had earlier warning signs been ignored?
He thanked her for calling.
Then he contacted the municipal security review team.
By the end of the week, an authorized technical investigation was underway.
The engineer insisted that the work be handled independently of his personal complaint against the former officer. He also requested that investigators preserve the distinction between documented technical faults and speculation about individual conduct.
His own experience had taught him how easily assumptions could become accusations.
He refused to make the same mistake.
The investigation began with archived maintenance reports, anonymized incident patterns, and approved access to historical diagnostic logs.
At first, the findings appeared unremarkable.
Several older vehicle gateways had suffered intermittent authentication failures.
Some faults involved worn connectors.
Others involved outdated firmware.