http://community.livejournal.com/spn_vs_cops_fic/

Well I kinda have a thing for cops fics, so there should be some of those kind of crossovers in my delicious account

SPN Xover Bones (http://www.livejournal.com/tools/memories.bml?user=spn_2008&keyword=SPN%20Xover%20Bones&filter=all)

The Evil that Men Do (http://asylums.insanejournal.com/lisaroquin_fic/3639.html#cutid1)

SPN Xover: Homicide : Déjà Vu (http://www.livejournal.com/tools/memories.bml?user=spn_2008&keyword=SPN%20Xover%3A%20Homicide&filter=all)

Law&Order Criminal Intent:In The Hotseat (In The Hotseat)

SPN Xover: NCIS: always be specific when you lie (http://anniehow.livejournal.com/64149.html)

SPN Xover: Law & Order SVU :Until Proven Guilty (http://www.livejournal.com/tools/memories.bml?user=spn_2008&keyword=SPN%20Xover%3A%20Law%20%26%20Order%3A%20SVU&filter=all)

SPN Xover: Criminal Minds (http://www.livejournal.com/tools/memories.bml?user=spn_2008&keyword=SPN%20Xover%3A%20Criminal%20Minds&filter=all)

Defect (http://www.fanfic.otherplaces.net/defect.htm) and Hell, and Back (http://www.fanfic.otherplaces.net/hell.htm)

SPN Xovers Numb3rs: Take a Long Line (http://derry667.livejournal.com/84656.html?format=light)

not limited to cops but does list by series so you can look at the cop shows such as bones, criminal minds, NCIS, psych, etc

http://community.livejournal.com/sn_crossovers/

Here's my Delicious with Criminal Minds and NCIS crossovers. ;3

Criminal Minds: http://www.delicious.com/Ms_Unlucky/CriminalMinds_Supernatural

NCIS: http://www.delicious.com/Ms_Unlucky/NCIS_Supernatural

Hermmm... I could have sworn I had more... Maybe I just didn't save them all...? o.O