The England team's training session was delayed on Wednesday for nearly two hours at Twickenham.
One of the players, while on his way back to the dressing room happened to look down and notice a suspicious looking, unknown white powdery substance at the end of the field.
Coach Clive Woodward immediately suspended practice while the Police were called in to investigate.
After a complete field analysis, the Police determined that the white substance, unknown to the players, was the try line. Practice was resumed when the officials decided that it was unlikely that the team would encounter the substance again.