I don't know anything about police procedure- sorry y'all.
The Text
"He texted me, I know he did," John said, shoving the phone at Lestrade. "Last night, I swear. Look!"
Lestrade looked at the phone. He wasn't convinced. "It just says your name. It's from an unknown number."
John sighed, frustrated. "I know it was Sherlock."
"We can trace where the text came from—maybe," Lestrade told him. "But don't be surprised if nothing comes up. I'll send it over to Donovan."
"You can't, she's biased, she doesn't want him to come home—"
"John," Lestrade snapped, interrupting. "You are exhausted. Go home."
"But—"
"Go. Home. I'll talk to you if we find anything out."
John nodded, defeated, and left.
Prompt was from AmonBeck, and it was: bias