Correct/detect Improper Case

I have been through our database and we have a culprit who has been inputting all names in full capitals which I have always found particularly annoying. I want to convert them all to proper case for which I found the code below. However how can I detect the set where they have inproper case.

CREATE FUNCTION dbo.pCase
(
@strIn VARCHAR(255)
)
RETURNS VARCHAR(255)
AS
BEGIN
IF @strIn IS NULL
RETURN NULL

DECLARE
@strOut VARCHAR(255),
@i INT,
@Up BIT,
@c VARCHAR(2)

SELECT
@strOut = '',
@i = 0,
@Up = 1

WHILE @i <= DATALENGTH(@strIn)
BEGIN
SET @c = SUBSTRING(@strIn,@i,1)
IF @c IN (' ','-','''')
BEGIN
SET @strOut = @strOut + @c
SET @Up = 1
END
ELSE
BEGIN
IF @up = 1
SET @c = UPPER(@c)
ELSE
SET @c = LOWER(@c)

SET @strOut = @strOut + @c
SET @Up = 0
END
SET @i = @i + 1
END
RETURN @strOut
END
GO