That's Cold

The crime scene technician approached me with an odd look on her face.

"I have the results here Captain."

I nodded, waiting for her to continue. After a moment, when she hadn't continued, I finally spoke.

"When you're ready."

She sighed.

"The DNA is from the victim's father, we have their data from a bank robbery ten years ago."

"Ok, that is reasonable, but I suspect there's a problem?"

"Well yes. He was killed during that bank robbery ten years ago."

I considered this, and then immediately arrested the victim, given she worked at an embryo storage and processing laboratory.