Final updates:

Fingerprints done.
A mob's be_syndicate is a direct copy of their preferences.

code/WorkInProgress/detective_work.dm

@@ -176,7 +176,7 @@ obj/machinery/computer/forensic_scanning
 						misc[i] = sum_list	//Store it!
 						break	//We found it, we're done here.
 			if(!merged)	//Nope!  Guess we have to add it!
-				var/list/templist[4]
+				var/list/templist[3]
 				templist[1] = A
 				templist[2] = A.suit_fibers
 				templist[3] = A.blood_DNA

code/game/gamemodes/autotraitor/autotraitor.dm

@@ -59,9 +59,6 @@
 
 /datum/game_mode/traitor/autotraitor/post_setup()
 	..()
-	for(var/mob/T in world)
-		if(T.mind in possible_traitors)
-			T.be_syndicate = 1
 	abandon_allowed = 1
 	traitorcheckloop()
 

code/game/gamemodes/revolution/rp-revolution.dm

@@ -183,7 +183,7 @@
 
 	for(var/mob/living/carbon/human/player in world)
 		if(player.client)
-			if(player.be_syndicate)
+			if(player.be_syndicate & BE_REV)
 				candidates += player.mind
 
 	if(candidates.len < 1)

code/modules/mob/new_player/new_player.dm

@@ -354,7 +354,6 @@
 	proc/create_character()
 		spawning = 1
 		var/mob/living/carbon/human/new_character = new(loc)
-		new_character.be_syndicate = src.preferences.be_special
 
 		close_spawn_windows()
 

code/modules/mob/new_player/preferences.dm

@@ -670,6 +670,7 @@ datum/preferences
 
 		character.age = age
 		character.dna.b_type = b_type
+		character.be_syndicate = be_special
 
 		character.r_eyes = r_eyes
 		character.g_eyes = g_eyes