A quick comparison.

[nonethefewer]

Death Masks, Jim Butcher:

Kincaid took a couple of steps up and glanced warily around the street. "Make up your mind, Dresden. I'm not keeping her out here for long."

"What about him?" I asked the Archive, and nodded toward Kincaid. "Can he be trusted?"

"Kincaid?" the girl asked, her voice whimsical. "Can you be trusted?"

"You're paid up through April," the man replied, his eyes still scanning the street. "After that I might get a better offer."

"There," the girl said to me. "Kincaid can be trusted until April. He's an ethical man, in his way."

Enchanter's End Game, Book 5 of the Belgariad, David Eddings:

"Can he be trusted?" Droblek asked bluntly, pointing at Issus.

Sadi's expression became whimsical. "Can you be trusted, Issus?" he asked.

"You've paid me for up to the end of the month." Issus shrugged. "After that, we'll see. I might get a better offer."

"You see?" Sadi said to the two seated men. "Issus can be trusted until the end of the month - at least as much as anybody in Sthiss Tor can be trusted. One thing I've noticed about Issus - he's a simple, uncomplicated man. Once you buy him, he stays bought. I think it's referred to as professional ethics."

No real point, just a note.