Excerpts from the deposition of Officer Jonathan Yuen of the Clearwater Police Department.

During the brief time period that Officer Jonathan Yuen was deposed he would respond with the phrase “I don’t recall or I don’t remember to twenty-eight of the questions posed to him. Officer Yuen’s memory deficit only occurs when asked questions regarding fellow police officers,medical investigator Marti Scholl or the presence of a “mysterious” couple who arrives at the scene “supposedly”when the “twenty-five minute” investigation is underway.
  
And what does a memory impaired officer do with his important notes?

Officer Jonathan Yuen, The Code of Silence, Clearwater Police De 002

A convenient lack of communication–no questions asked.

Officer Jonathan Yuen, Code of Silence,Helping out Detective Ste 001

Excerpts of redundancy 
 
Officer Jonathan Yuen, Denise Miscavige,Codeof Silence 001

Officer Jonathan Yuen, The Code of Silence, 001

Officer Jonathan Yuen, The Code of Silence, Clearwater Police De 001

Officer Jonathan Yuen,He's no Sherlock 001

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Officer Jonathan Yuen,Code of Silence,Clearwater Police Departm 001

Officer Jonathan Yuen, Code of Silence 002

Officer Yuens testimony regarding Kyle’s medication.

Officer Jonathan Yuen,Code of Silence 001

Additional literature

“Police Corruption and Misconduct”. TheFreeDictionary.com.
Chin, Gabriel; Wells, Scott (1998). “The “Blue Wall of Silence” as Evidence of Bias and Motive to Lie: A New Approach to Police Perjury”. University of Pittsburgh Law Review 59: 233. Retrieved 2012-09-29.