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I'll have to have another look Darknight. Mine's a much older UK edition of the book, but it wouldn't be the first time the UK & US versions differ!

It is indeed about the poison-pen letters in The Moving Finger. I can't find any reference about Miss Marple having known any of the police officers on this case for years...
Would you care to reconsider the answer? In my edition (copyright 1943, US print run year 2000), at least, Superintendent Nash is the county police officer who calls in the London expert on anonymous letters.
Interesting quote by this copper: "Very nice - very nice indeed."
...spoken while looking over the pieces of evidence gathered so far.
Found it, Superintendent Nash!
Is it something to do with anonymous letters? From The Moving Finger, a Scotland Yard man is sent down to solve that but I can't remember his name....it's a policeman that Miss M has known for years...'Dear Derek' or something of that kind?

OK, the original clue:
"Well, I specialize in a rather unpleasant subject in criminology. The hidden unpleasantness in quite ordinary people is part of my professional knowledge. It's a good thing that I am an official member of the police, otherwise people might feel alarmed by my evaluation of some pieces of evidence."
Hints that have been requested:
Is he a psychologist? No professional psychology degree had been mentioned, but knowledge of a particular type of psychology certainly helps this police officer in his job.
Is he Scotland Yard? He has been called down from London by the local police that has been on the case.
The rest of it, the police officer figures he'd better do the explaining:
"The type of case I work on, there's seldom a definitive *scene* of crime. There's often many *pieces* of evidence, but many of those pieces never come forward because people who come by them think they're either unimportant or disgusting. This is a type of crime that can be very hurtful to victims, and yet one criminal might be at it for months before any of the victims decides to get the police involved. When I do get called in on the case, I examine the pieces of evidence for both their more obvious characteristics as well as the psychology that they reveal."
"More obvious characteristics" here being fingerprints and so on...
Is he Scotland Yard? Perhaps a scene of crime specialist or something of the kind?
Um... I don't remember at the moment, so I can't swear definitely if this police official has or does not have a college / university / graduate / doctorate / et al. degree in psychology. I don't recall him being addressed as "Dr. _____" or anything like that...
But, to clarify, I'll explain that he is the type of specialized copper who gets called in by the policemen already working on a case. Hope that helps.
So this guy is a psycologist?
"Well, I specialize in a rather unpleasant subject in criminology. The hidden unpleasantness in quite ordinary people is part of my professional knowledge. It's a good thing that I am an official member of the police, otherwise people might feel alarmed by my evaluation of some pieces of evidence."
Any specific request for hints? I am not much good at thinking up hints for this one.
"Well, I specialize in a rather unpleasant subject in criminology. The hidden unpleasantness in quite ordinary people is part of my professional knowledge. It's a good thing that I am an official member of the police, otherwise people might feel alarmed by my evaluation of some pieces of evidence."
Get well soon , Cameron x
Thanks cameron, and no sorries needed here. Hope your leg gets better soon. 
I'll put up the next puzzle after checking whether I did post the quote puzzle... no responses there, hmm.
I hope your leg heals soon Cameron. XX
Yea
you got it right. It is Chief Inspector Taverner. Sorry I didn't get back to you sooner but I have felt tired from being in the hospital in November due to a broken leg and I had some surgery on it too.
Chief Inspector Taverner from Crooked House? The case seemed open-and-shut that Brenda and her "boyfriend" were the murderers, but the criminal might have been another member of the family.
Thanks! I'll go and keep thinking / looking...
No I am afraid it is not any of the guesses you have made but this official appears in a non-series book
So, cameron... is any of our guesses getting closer yet? 
Could it be Richard Hardcastle in The Clocks? I forget though if he's only Inspector, or a Chief Inspector.
Chief Inspector Kemp from "Sparkling Cyanide"?
Ten people, each with something to hide and something to fear, are invited to a lonely mansion on Soldier Island by a host who, surprisingly, fails to appear.
When the wealthy patriarch, Aristide, is murdered, suspicion falls on the whole household. ...
Travelling on the Orient Express, Poirot is approached by a desperate American. Afraid that someone plans to kill him, Ratchett asks Poirot for help ...
Masthead Photography: Joan Hickson image © BBC
MURDER MOST FOUL © Turner Entertainment Co. A Warner Bros. Entertainment Company. All Rights Reserved.
AGATHA CHRISTIE® POIROT® MARPLE® Copyright ©2009 Agatha Christie Limited. All rights reserved.
Hi all! There seem to be a good many police officers in Agatha Christie's novels (sometimes recurring characters). So for this little game, try to guess which of those police officers is being described...
An example would be "I am a distinguished man, a good friend of M. Hercule Poirot. I live in Woodleigh Common with my sister, Elspeth. Who am I?" The answer to is would be "Superintendent Spence, who appeared in 'Hallowe'en Party' and 'Mrs McGinty's Dead'"
Here's the first one. "I have an unimaginative appearance, but in reality I am a very imaginative man. Who am I?"