Did LeBron and the Cavs violate the NBA's concussion protocol?

During the first quarter of Game 3 of the NBA Finals, LeBron James ran head-first into the shoulder of teammate Tristan Thompson, leaving James on the ground in pain for several minutes.

Trainers and teammates came over to inspect James, who was deemed well enough to return to the game immediately after the timeout.

However, some are raising the question of whether the Cleveland Cavaliers violated the NBA's concussion protocol in allowing LeBron to return to the game without comprehensive concussion testing.