[Dearth]

Depends on your definition of documentaries as reality shows are considered "documentaries" but I tend not to watch most american reality shows as they over sensationalize everything without telling you anything

Reality shows

Survivorman
Border Security
Alaska State troopers
CWD
To serve and protect(most consider it boring but it shows what police across Canada really face on a daily basis)
Mayday(love watching this one when I fly)

Actual documentaries

Naked science
Planet Earth series
Shark week
Lockup(msnbc)