Sentence:  He sucked in his breath and kept quiet while Killpath laid down the sheet again , wound the gold wire stems of his glasses around his ears and then , eying the report as it lay before him on the desk , intoned , `` Acting Lieutenant Gunnar Matson one failed to see that the station keeper was properly relieved two absented himself throughout the entire watch without <WSD>checking</WSD> on the station 's activities or the whereabouts of his section sergeants three permitted members of the Homicide Detail of the Inspector's Bureau to arrogate for their own convenience a patrolman who was thereby prevented from carrying on his proper assignment four failed to notify the station commander Acting Captain O. T. Killpath of a homicide occurring in the district five frequented extralegal establishments known as after-hours spots for purposes of an unofficial and purportedly social nature and six '' - he leaned back and peeled off his glasses `` - failed to co-operate with the Acting Captain by returning promptly when so ordered . 
Meaning of the word marked with <WSD> tags:  examine so as to determine accuracy, quality, or condition