Jagratha

ജാഗ്രത is a 1989 Malayalam film directed by K. Madhu, starring Mammootty, Mukesh and Jagathy Sreekumar.
This film is the second in the series of the CBI investigative thrillers featuring Mammootty as CBI officer Sethurama Iyer. Oru CBI Diary Kurippu (1988) is the prequel to this film and sequels are Sethurama Iyer CBI (2004) and Nerariyan CBI (2005). A fifth film in the franchise has been announced and is now in the pre-production stage.  
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Pakal Nakshatrangal

പകല്‍  നക്ഷത്രങ്ങള്‍   is a 2008 Malayalam film directed by Rajeev Nath. Actor Anoop Menon made his debut in screenplay writing through this movie. The film is about the lives of a group of intellectuals in Kerala in the later half of the nineties. The film was critically acclaimed but was a commercial failure.
Set in the backdrop of cinema, Pakal Nakshatrangal tells the story of a script writer-director named Siddharthan getting entangled in a murder, while writing a murder mystery.
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Oru CBI Diary Kurippu

ഒരു സിബിഐ ഡയറി കുറിപ്പ് is a 1988 Malayalam film directed by K Madhu, scripted by S. N. Swami, and starring Mammootty, Suresh Gopi and Jagathy Sreekumar.

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Positive

പോസിറ്റീവ്  is a 2008 film by V. K. Prakash starring Jayasurya, Suraj and Ananya.Raju (Skanda or Suraj), Winnie (Vani Kishore), udayan (Ananya). But one day jyothi left hostel with out telling anything to Raju. Winne's parents try to get her married off to a Police Officer named Aniyan (Jayasurya). Even though this marriage doesn't takes place, something drastic happens. They now has to face Aniyan, who confronts them as a police officer.
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Kariyilakkattupole

A Padmarajan film, Mohanlal  as a police officer, investigating the murder of a celebrity (Mammootty)Click here to watch