diff --git a/code/game/dna/dna2_helpers.dm b/code/game/dna/dna2_helpers.dm
index 53f248d1e91..c15c0eebee4 100644
--- a/code/game/dna/dna2_helpers.dm
+++ b/code/game/dna/dna2_helpers.dm
@@ -196,7 +196,3 @@
 		return 1
 	else
 		return 0
-
-// Used below, simple injection modifier.
-/proc/probinj(var/pr, var/inj)
-	return prob(pr+inj*pr)
diff --git a/code/game/dna/genes/disabilities.dm b/code/game/dna/genes/disabilities.dm
index 4505dc1c1db..bbad4a7912f 100644
--- a/code/game/dna/genes/disabilities.dm
+++ b/code/game/dna/genes/disabilities.dm
@@ -28,6 +28,7 @@
 	return 1 // Always set!
 
 /datum/dna/gene/disability/activate(var/mob/M, var/connected, var/flags)
+	..()
 	if(mutation && !(mutation in M.mutations))
 		M.mutations.Add(mutation)
 	if(disability)
@@ -40,6 +41,7 @@
 		testing("[name] has no activation message.")
 
 /datum/dna/gene/disability/deactivate(var/mob/M, var/connected, var/flags)
+	..()
 	if(mutation && (mutation in M.mutations))
 		M.mutations.Remove(mutation)
 	if(disability)
diff --git a/code/game/dna/genes/gene.dm b/code/game/dna/genes/gene.dm
index a39da68c92e..a3781f9985d 100644
--- a/code/game/dna/genes/gene.dm
+++ b/code/game/dna/genes/gene.dm
@@ -39,7 +39,7 @@
 
 // Called when the gene activates.  Do your magic here.
 /datum/dna/gene/proc/activate(var/mob/living/M, var/connected, var/flags)
-	M.gene_stability += instability
+	M.gene_stability -= instability
 	return
 
 /**
@@ -47,7 +47,7 @@
 * Only called when the block is deactivated.
 */
 /datum/dna/gene/proc/deactivate(var/mob/living/M, var/connected, var/flags)
-	M.gene_stability -= instability
+	M.gene_stability += instability
 	return
 
 // This section inspired by goone's bioEffects.
@@ -112,15 +112,17 @@
 	if(flags & MUTCHK_FORCED)
 		return 1
 	// Probability check
-	return probinj(activation_prob,(flags&MUTCHK_FORCED))
+	return prob(activation_prob)
 
 /datum/dna/gene/basic/activate(var/mob/M)
+	..()
 	M.mutations.Add(mutation)
 	if(activation_messages.len)
 		var/msg = pick(activation_messages)
 		to_chat(M, "<span class='notice'>[msg]</span>")
 
 /datum/dna/gene/basic/deactivate(var/mob/M)
+	..()
 	M.mutations.Remove(mutation)
 	if(deactivation_messages.len)
 		var/msg = pick(deactivation_messages)
diff --git a/code/game/dna/genes/goon_disabilities.dm b/code/game/dna/genes/goon_disabilities.dm
index 5ec04865591..2afb9b7bd83 100644
--- a/code/game/dna/genes/goon_disabilities.dm
+++ b/code/game/dna/genes/goon_disabilities.dm
@@ -38,6 +38,16 @@
 	..()
 	block=RADBLOCK
 
+
+/datum/dna/gene/disability/radioactive/can_activate(var/mob/M,var/flags)
+	if(!..())
+		return 0
+	if(ishuman(M))
+		var/mob/living/carbon/human/H = M
+		if(H.species && H.species.flags & RADIMMUNE && !(flags & MUTCHK_FORCED))
+			return 0
+	return 1
+
 /datum/dna/gene/disability/radioactive/OnMobLife(var/mob/living/owner)
 	var/radiation_amount = abs(min(owner.radiation - 20,0))
 	owner.apply_effect(radiation_amount, IRRADIATE)
diff --git a/code/game/dna/genes/powers.dm b/code/game/dna/genes/powers.dm
index 2f211f7a057..5600005271e 100644
--- a/code/game/dna/genes/powers.dm
+++ b/code/game/dna/genes/powers.dm
@@ -34,6 +34,14 @@
 /datum/dna/gene/basic/increaserun/New()
 	block=INCREASERUNBLOCK
 
+/datum/dna/gene/basic/increaserun/can_activate(var/mob/M,var/flags)
+	if(!..())
+		return 0
+	if(ishuman(M))
+		var/mob/living/carbon/human/H = M
+		if(H.species && H.species.slowdown && !(flags & MUTCHK_FORCED))
+			return 0
+	return 1
 
 /datum/dna/gene/basic/heat_resist
 	name="Heat Resistance"
diff --git a/code/game/gamemodes/wizard/wizard.dm b/code/game/gamemodes/wizard/wizard.dm
index d98eae3135d..c5f8271ab63 100644
--- a/code/game/gamemodes/wizard/wizard.dm
+++ b/code/game/gamemodes/wizard/wizard.dm
@@ -195,7 +195,7 @@
 	to_chat(wizard_mob, "In your pockets you will find a teleport scroll. Use it as needed.")
 	wizard_mob.mind.store_memory("<B>Remember:</B> do not forget to prepare your spells.")
 	wizard_mob.update_icons()
-	wizard_mob.gene_stability = 2 * DEFAULT_GENE_STABILITY //magic
+	wizard_mob.gene_stability += DEFAULT_GENE_STABILITY //magic
 	return 1
 
 
diff --git a/code/game/objects/items/devices/scanners.dm b/code/game/objects/items/devices/scanners.dm
index 7138a4515be..7401a593e99 100644
--- a/code/game/objects/items/devices/scanners.dm
+++ b/code/game/objects/items/devices/scanners.dm
@@ -226,7 +226,7 @@ REAGENT SCANNER
 			for(var/datum/wound/W in e.wounds) if(W.internal)
 				user.show_message(text("\red Internal bleeding detected. Advanced scanner required for location."), 1)
 				break
-		if(M:vessel)
+		if(H.vessel)
 			var/blood_volume = round(M:vessel.get_reagent_amount("blood"))
 			var/blood_percent =  blood_volume / 560
 			blood_percent *= 100
@@ -246,7 +246,14 @@ REAGENT SCANNER
 		if(implant_detect)
 			user.show_message("<span class='notice'>Detected cybernetic modifications:</span>")
 			user.show_message("<span class='notice'>[implant_detect]</span>")
-
+		if(H.gene_stability < 40)
+			user.show_message("<span class='userdanger'>Subject's genes are quickly breaking down!</span>")
+		else if(H.gene_stability < 70)
+			user.show_message("<span class='danger'>Subject's genes are showing signs of spontenous breakdown.</span>")
+		else if(H.gene_stability < 85)
+			user.show_message("<span class='warning'>Subject's genes are showing minor signs of instability.</span>")
+		else
+			user.show_message("<span class='notice'>Subject's genes are stable.</span>")
 	src.add_fingerprint(user)
 	return
 
@@ -523,4 +530,3 @@ REAGENT SCANNER
 	if (T.cores > 1)
 		user.show_message("Anomalious slime core amount detected", 1)
 	user.show_message("Growth progress: [T.amount_grown]/10", 1)
-
diff --git a/code/game/objects/items/weapons/dna_injector.dm b/code/game/objects/items/weapons/dna_injector.dm
index 2fc12e812fe..f243e1a6ab9 100644
--- a/code/game/objects/items/weapons/dna_injector.dm
+++ b/code/game/objects/items/weapons/dna_injector.dm
@@ -93,7 +93,7 @@
 					M.dna.UpdateSE()
 				else
 					M.dna.SetSEValue(block,src.GetValue())
-				domutcheck(M, null, block!=null)
+				domutcheck(M, null, 0)
 				M.update_mutations()
 			if(H)
 				H.sync_organ_dna(assimilate = 0, old_ue = prev_ue)
diff --git a/code/modules/mob/living/carbon/human/life.dm b/code/modules/mob/living/carbon/human/life.dm
index 9a56765bf67..3a394e002d5 100644
--- a/code/modules/mob/living/carbon/human/life.dm
+++ b/code/modules/mob/living/carbon/human/life.dm
@@ -176,21 +176,22 @@
 		if(gene.is_active(src))
 			speech_problem_flag = 1
 			gene.OnMobLife(src)
-	if(gene_stability < 85)
-		if(prob(5))
-			adjustFireLoss(2)
+	if(gene_stability < 85)
+		var/instability = DEFAULT_GENE_STABILITY - gene_stability
+		if(prob(instability / 10))
+			adjustFireLoss(min(6, instability / 12))
 			to_chat(src, "<span class='danger'>You feel like your skin is burning and bubbling off!</span>")
 		if(gene_stability < 70)
-			if(prob(3))
-				adjustCloneLoss(2)
+			if(prob(instability / 12))
+				adjustCloneLoss(min(5, instability / 15))
 				to_chat(src, "<span class='danger'>You feel as if your body is warping.</span>")
-			if(prob(5))
-				adjustToxLoss(3)
+			if(prob(instability / 10))
+				adjustToxLoss(min(6, instability / 12))
 				to_chat(src, "<span class='danger'>You feel weak and nauseous.</span>")
-			if(gene_stability < 40 && getCloneLoss() > 50 && prob(5))
-				to_chat(src, "<span class='userdanger'>You feel incredibly sick... Something isn't right!</span>")
-				spawn(180)
-					if(getCloneLoss() > 10)
+			if(gene_stability < 40 && prob(1))
+				to_chat(src, "<span class='biggerdanger'>You feel incredibly sick... Something isn't right!</span>")
+				spawn(300)
+					if(gene_stability < 40)
 						gib()
 
 	if(!(species.flags & RADIMMUNE))