Adding fingerprints to actions:

-breaking windoors
-wrenching/unwrenching pipe dispensers
-locking/unlocking crates
-breaking grilles
-smashing windows
-deconning walls

code/game/machinery/doors/windowdoor.dm

@@ -150,10 +150,14 @@
 /obj/machinery/door/window/proc/take_damage(var/damage)
 	src.health = max(0, src.health - damage)
 	if (src.health <= 0)
-		new /obj/item/weapon/shard(src.loc)
-		new /obj/item/weapon/shard(src.loc)
-		new /obj/item/stack/rods(src.loc, 2)
-		new /obj/item/stack/cable_coil(src.loc, 2)
+		var/debris = list(
+			new /obj/item/weapon/shard(src.loc),
+			new /obj/item/weapon/shard(src.loc),
+			new /obj/item/stack/rods(src.loc, 2),
+			new /obj/item/stack/cable_coil(src.loc, 2)
+			)
+		for(var/obj/fragment in debris)
+			transfer_fingerprints_to(fragment)
 		src.density = 0
 		qdel(src)
 		return
@@ -223,6 +227,8 @@
 	if (src.operating)
 		return
 
+	add_fingerprint(user)
+
 	//Emags and ninja swords? You may pass.
 	if (src.density && (istype(I, /obj/item/weapon/card/emag)||istype(I, /obj/item/weapon/melee/energy/blade)))
 		src.operating = -1
@@ -241,7 +247,7 @@
 		open()
 		emagged = 1
 		return 1
-	
+
 	//If windoor is unpowered, crowbar, fireaxe and armblade can force it.
 	if(istype(I, /obj/item/weapon/crowbar) || istype(I, /obj/item/weapon/twohanded/fireaxe) || istype(I, /obj/item/weapon/melee/arm_blade) )
 		if(stat & NOPOWER)
@@ -260,8 +266,7 @@
 		if(I.damtype == BURN || I.damtype == BRUTE)
 			take_damage(aforce)
 		return
-	
-	src.add_fingerprint(user)
+
 	if (!src.requiresID())
 		//don't care who they are or what they have, act as if they're NOTHING
 		user = null

code/game/machinery/pipe/pipe_dispenser.dm

@@ -82,6 +82,7 @@
 			playsound(src.loc, 'sound/items/Ratchet.ogg', 50, 1)
 			user << "<span class='notice'>You begin to fasten \the [src] to the floor...</span>"
 			if (do_after(user, 40))
+				add_fingerprint(user)
 				user.visible_message( \
 					"[user] fastens \the [src].", \
 					"<span class='notice'>You have fastened \the [src]. Now it can dispense pipes.</span>", \
@@ -94,6 +95,7 @@
 			playsound(src.loc, 'sound/items/Ratchet.ogg', 50, 1)
 			user << "<span class='notice'>You begin to unfasten \the [src] from the floor...</span>"
 			if (do_after(user, 20))
+				add_fingerprint(user)
 				user.visible_message( \
 					"[user] unfastens \the [src].", \
 					"<span class='notice'>You have unfastened \the [src]. Now it can be pulled somewhere else.</span>", \

code/game/objects/structures/crates_lockers/closets/secure/secure_closets.dm

@@ -43,6 +43,7 @@
 /obj/structure/closet/secure_closet/proc/togglelock(mob/user as mob)
 	if(src.allowed(user))
 		src.locked = !src.locked
+		add_fingerprint(user)
 		for(var/mob/O in viewers(user, 3))
 			if((O.client && !( O.blinded )))
 				O << "<span class='notice'>The locker has been [locked ? null : "un"]locked by [user].</span>"

code/game/objects/structures/crates_lockers/crates.dm

@@ -290,6 +290,7 @@
 			src.locked = 0
 			overlays.Cut()
 			overlays += greenlight
+			add_fingerprint(user)
 			return
 		else
 			user << "<span class='notice'>[src] is locked.</span>"
@@ -303,6 +304,7 @@
 		src.locked = 1
 		overlays.Cut()
 		overlays += redlight
+		add_fingerprint(user)
 		return
 	else if ( (istype(W, /obj/item/weapon/card/emag)||istype(W, /obj/item/weapon/melee/energy/blade)) && locked &&!broken)
 		overlays.Cut()
@@ -313,6 +315,7 @@
 		src.locked = 0
 		src.broken = 1
 		user << "<span class='notice'>You unlock \the [src].</span>"
+		add_fingerprint(user)
 		return
 
 	return ..()

code/game/objects/structures/grille.dm

@@ -101,14 +101,14 @@
 
 /obj/structure/grille/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	user.changeNext_move(8)
+	add_fingerprint(user)
 	if(istype(W, /obj/item/weapon/wirecutters))
 		if(!shock(user, 100))
 			playsound(loc, 'sound/items/Wirecutter.ogg', 100, 1)
-			if(destroyed)
-				new /obj/item/stack/rods(loc)
-			else
-				new /obj/item/stack/rods(loc)
-				new /obj/item/stack/rods(loc)
+			var/obj/item/stack/rods/newrods = new(loc)
+			transfer_fingerprints_to(newrods)
+			if(!destroyed)
+				newrods.amount = 2
 			qdel(src)
 	else if((istype(W, /obj/item/weapon/screwdriver)) && (istype(loc, /turf/simulated) || anchored))
 		if(!shock(user, 90))
@@ -181,15 +181,16 @@
 
 /obj/structure/grille/proc/healthcheck()
 	if(health <= 0)
+		var/obj/item/stack/rods/newrods = new(loc)
+		transfer_fingerprints_to(newrods)
+
 		if(!destroyed)
 			icon_state = "brokengrille"
 			density = 0
 			destroyed = 1
-			new /obj/item/stack/rods(loc)
 
 		else
 			if(health <= -6)
-				new /obj/item/stack/rods(loc)
 				qdel(src)
 				return
 	return

code/game/objects/structures/window.dm

@@ -220,15 +220,19 @@
 			var/index = null
 			index = 0
 			while(index < 2)
-				new /obj/item/weapon/shard(loc)
-				if(reinf) new /obj/item/stack/rods(loc)
+				spawnfragments()
 				index++
 		else
-			new /obj/item/weapon/shard(loc)
-			if(reinf) new /obj/item/stack/rods(loc)
+			spawnfragments()
 		qdel(src)
 		return
 
+/obj/structure/window/proc/spawnfragments()
+	var/newshard = new /obj/item/weapon/shard(loc)
+	transfer_fingerprints_to(newshard)
+	if(reinf)
+		var/newrods = new /obj/item/stack/rods(loc)
+		transfer_fingerprints_to(newrods)
 
 /obj/structure/window/verb/rotate()
 	set name = "Rotate Window Counter-Clockwise"

code/game/turfs/simulated/walls.dm

@@ -14,10 +14,11 @@
 	var/hardness = 40 //lower numbers are harder. Used to determine the probability of a hulk smashing through.
 
 /turf/simulated/wall/proc/dismantle_wall(devastated=0, explode=0)
+	var/newgirder = null
 	if(istype(src,/turf/simulated/wall/r_wall))
 		if(!devastated)
 			playsound(src, 'sound/items/Welder.ogg', 100, 1)
-			new /obj/structure/girder/reinforced(src)
+			newgirder = new /obj/structure/girder/reinforced(src)
 			new /obj/item/stack/sheet/plasteel( src )
 		else
 			new /obj/item/stack/sheet/metal( src )
@@ -35,7 +36,7 @@
 	else
 		if(!devastated)
 			playsound(src, 'sound/items/Welder.ogg', 100, 1)
-			new /obj/structure/girder(src)
+			newgirder = new /obj/structure/girder(src)
 			if (mineral == "metal")
 				new /obj/item/stack/sheet/metal( src )
 				new /obj/item/stack/sheet/metal( src )
@@ -54,6 +55,9 @@
 				new M( src )
 				new /obj/item/stack/sheet/metal( src )
 
+	if(newgirder)
+		transfer_fingerprints_to(newgirder)
+
 	for(var/obj/O in src.contents) //Eject contents!
 		if(istype(O,/obj/structure/sign/poster))
 			var/obj/structure/sign/poster/P = O
@@ -175,6 +179,8 @@
 	var/turf/T = user.loc	//get user's location for delay checks
 
 	//DECONSTRUCTION
+	add_fingerprint(user)
+
 	if( istype(W, /obj/item/weapon/weldingtool) )
 		var/obj/item/weapon/weldingtool/WT = W
 		if( WT.remove_fuel(0,user) )