Something from a Past Episode that many have missed... Look at your own peril:
Also, something from the "Making of True Detective" Featurette that is on HBO On Demand:

Also, something from the "Making of True Detective" Featurette that is on HBO On Demand:
About 4 Minutes in during the Segment when they are talking about the Characters of Cohle and Hart, there is a 3-4 Second Shot of the Present Day(2012) Russ & Marty in a dark make shift evidence room with a evidence board, both of them drinking beers together... So, either they have been working together all along, or they definitely get back together to work the case.
Also, a slightly more up for interpretation tidbit, but when Michelle Monohan(plays Marty's Wife) is talking about the characters of Cohle & hart, she says "I think that's why they've stayed together for 17 years", which would seem to indicate that the whole 2002 Blowup between them and they haven't spoke for 10 years may have been fake and they have been working together in secret all this time... OR, maybe she just misspoke.
Also, a slightly more up for interpretation tidbit, but when Michelle Monohan(plays Marty's Wife) is talking about the characters of Cohle & hart, she says "I think that's why they've stayed together for 17 years", which would seem to indicate that the whole 2002 Blowup between them and they haven't spoke for 10 years may have been fake and they have been working together in secret all this time... OR, maybe she just misspoke.