diff --git a/code/__DEFINES/mode.dm b/code/__DEFINES/mode.dm
index 45c098ac0a21..9903f4991782 100644
--- a/code/__DEFINES/mode.dm
+++ b/code/__DEFINES/mode.dm
@@ -72,6 +72,7 @@
 #define MODE_HARDCORE_PERMA (1<<9) /// Toggles Hardcore for all marines, meaning they instantly perma upon death
 #define MODE_DISPOSABLE_MOBS (1<<10) // Toggles if mobs fit in disposals or not. Off by default.
 #define MODE_BYPASS_JOE (1<<11) // Toggles if ghosts can bypass Working Joe spawn limitations, does NOT bypass WL requirement. Off by default.
+#define MODE_ALLOW_ZOMBIES (1<<12) /// Whether or not zombiism can spread through non admin means.
 
 #define ROUNDSTATUS_FOG_DOWN 1
 #define ROUNDSTATUS_PODDOORS_OPEN 2
diff --git a/code/datums/diseases/black_goo.dm b/code/datums/diseases/black_goo.dm
index 183cdadf17aa..c90c59a08d26 100644
--- a/code/datums/diseases/black_goo.dm
+++ b/code/datums/diseases/black_goo.dm
@@ -175,16 +175,21 @@
 		return FALSE
 	playsound(loc, 'sound/weapons/bladeslice.ogg', 25, 1, 5)
 
-	if(ishuman_strict(target))
-		var/mob/living/carbon/human/human = target
-
-		if(locate(/datum/disease/black_goo) in human.viruses)
-			to_chat(user, SPAN_XENOWARNING("<b>You sense your target is infected.</b>"))
-		else
-			var/bio_protected = max(CLOTHING_ARMOR_HARDCORE - human.getarmor(user.zone_selected, ARMOR_BIO), 0)
-			if(prob(bio_protected))
-				target.AddDisease(new /datum/disease/black_goo)
-				to_chat(user, SPAN_XENOWARNING("<b>You sense your target is now infected.</b>"))
+	if(SSticker.mode && MODE_HAS_TOGGLEABLE_FLAG(MODE_ALLOW_ZOMBIES))
+		if(ishuman_strict(target))
+			var/mob/living/carbon/human/human = target
+
+			if(locate(/datum/disease/black_goo) in human.viruses)
+				to_chat(user, SPAN_XENOWARNING("<b>You sense your target is infected.</b>"))
+			else
+				var/bio_protected = max(CLOTHING_ARMOR_HARDCORE - human.getarmor(user.zone_selected, ARMOR_BIO), 0)
+				if(prob(bio_protected))
+					target.AddDisease(new /datum/disease/black_goo)
+					to_chat(user, SPAN_XENOWARNING("<b>You sense your target is now infected.</b>"))
+	else
+		message_admins(SPAN_HIGHDANGER("[key_name(user)] [ADMIN_JMP(user)] tried to infect [key_name(target)] [ADMIN_JMP(target)] with black-goo!"))
+		return FALSE
+
 
 	target.apply_effect(2, SLOW)
 
diff --git a/code/datums/diseases/mob_procs.dm b/code/datums/diseases/mob_procs.dm
index c27efecdff84..11ccf707d9b0 100644
--- a/code/datums/diseases/mob_procs.dm
+++ b/code/datums/diseases/mob_procs.dm
@@ -7,6 +7,10 @@
 
 // This proc has some procs that should be extracted from it. I believe we can develop some helper procs from it - Rockdtben
 /mob/proc/contract_disease(datum/disease/virus, skip_this = 0, force_species_check=1, spread_type = -5)
+	if(istype(virus, /datum/disease/black_goo) && (SSticker.mode && !MODE_HAS_TOGGLEABLE_FLAG(MODE_ALLOW_ZOMBIES)))
+		message_admins(SPAN_HIGHDANGER("Something attempted to infect [key_name(src)] [ADMIN_JMP(src)] with black-goo!"))
+		return FALSE
+
 	if(stat == DEAD)
 		return
 	if(istype(virus, /datum/disease/advance))
diff --git a/code/game/objects/effects/decals/cleanable/misc.dm b/code/game/objects/effects/decals/cleanable/misc.dm
index a88b4ea5c5ea..8b8a8d0795e3 100644
--- a/code/game/objects/effects/decals/cleanable/misc.dm
+++ b/code/game/objects/effects/decals/cleanable/misc.dm
@@ -163,6 +163,9 @@
 	if(!istype(H)) return
 	if(H.species.name == "Human")
 		if(!H.shoes && prob(50))
+			if(SSticker.mode && !MODE_HAS_TOGGLEABLE_FLAG(MODE_ALLOW_ZOMBIES))
+				message_admins(SPAN_HIGHDANGER("[src] at [ADMIN_JMP(src)] tried to pass black-goo infection to [key_name(H)]!"))
+				return FALSE
 			H.contract_disease(new /datum/disease/black_goo)
 
 
diff --git a/code/modules/admin/admin_verbs.dm b/code/modules/admin/admin_verbs.dm
index e5fd014e5706..26940e71a2f3 100644
--- a/code/modules/admin/admin_verbs.dm
+++ b/code/modules/admin/admin_verbs.dm
@@ -159,7 +159,8 @@ GLOBAL_LIST_INIT(admin_verbs_major_event, list(
 	/client/proc/enable_podlauncher,
 	/client/proc/change_taskbar_icon,
 	/client/proc/change_weather,
-	/client/proc/admin_blurb
+	/client/proc/admin_blurb,
+	/client/proc/toggle_zombies
 ))
 
 GLOBAL_LIST_INIT(admin_verbs_spawn, list(
@@ -216,6 +217,7 @@ GLOBAL_LIST_INIT(admin_verbs_debug, list(
 	/datum/admins/proc/view_href_log, /*shows the server HREF log for this round*/
 	/datum/admins/proc/view_tgui_log, /*shows the server TGUI log for this round*/
 	/client/proc/admin_blurb,
+	/client/proc/toggle_zombies,
 ))
 
 GLOBAL_LIST_INIT(admin_verbs_debug_advanced, list(
diff --git a/code/modules/admin/tabs/admin_tab.dm b/code/modules/admin/tabs/admin_tab.dm
index 356762b5edd7..7448d6aa8a56 100644
--- a/code/modules/admin/tabs/admin_tab.dm
+++ b/code/modules/admin/tabs/admin_tab.dm
@@ -881,3 +881,17 @@
 
 	SSticker.mode.toggleable_flags ^= MODE_BYPASS_JOE
 	message_admins("[src] has [MODE_HAS_TOGGLEABLE_FLAG(MODE_BYPASS_JOE) ? "allowed players to bypass (except whitelist)" : "prevented players from bypassing"] Working Joe spawn conditions.")
+
+/client/proc/toggle_zombies()
+	set name = "Toggle Zombie Spread"
+	set category = "Admin.Flags"
+
+	if(!admin_holder || !check_rights(R_DEBUG|R_EVENT))
+		return
+
+	if(!SSticker.mode)
+		to_chat(usr, SPAN_WARNING("A mode hasn't been selected yet!"))
+		return
+
+	SSticker.mode.toggleable_flags ^= MODE_ALLOW_ZOMBIES
+	message_admins("[src] has [MODE_HAS_TOGGLEABLE_FLAG(MODE_ALLOW_ZOMBIES) ? "allowed" : "forbidden"] zombiism to spread.")
diff --git a/code/modules/reagents/chemistry_properties/prop_special.dm b/code/modules/reagents/chemistry_properties/prop_special.dm
index 52354f0d6b01..78177dadf5e4 100644
--- a/code/modules/reagents/chemistry_properties/prop_special.dm
+++ b/code/modules/reagents/chemistry_properties/prop_special.dm
@@ -215,6 +215,9 @@
 	if(!ishuman(M))
 		return
 	var/mob/living/carbon/human/H = M
+	if(SSticker.mode && !MODE_HAS_TOGGLEABLE_FLAG(MODE_ALLOW_ZOMBIES))
+		message_admins(SPAN_HIGHDANGER("[holder] tried to pass black-goo infection to [key_name(H)] [ADMIN_JMP(H)]!"))
+		return FALSE
 	H.contract_disease(new /datum/disease/black_goo, 1)
 
 /datum/chem_property/special/curing
diff --git a/code/modules/reagents/chemistry_reagents/other.dm b/code/modules/reagents/chemistry_reagents/other.dm
index ae1a42bd5e6d..a0cf6dfd8a17 100644
--- a/code/modules/reagents/chemistry_reagents/other.dm
+++ b/code/modules/reagents/chemistry_reagents/other.dm
@@ -668,6 +668,9 @@
 	if(ishuman(M))
 		var/mob/living/carbon/human/H = M
 		if(H.species.name == "Human")
+			if(SSticker.mode && !MODE_HAS_TOGGLEABLE_FLAG(MODE_ALLOW_ZOMBIES))
+				message_admins(SPAN_HIGHDANGER("Black goo reaction-mob tried to infect [key_name(H)] [ADMIN_JMP(H)] with black-goo!"))
+				return FALSE
 			H.contract_disease(new /datum/disease/black_goo)
 
 /datum/reagent/blackgoo/reaction_turf(turf/T, volume)