diff --git a/lua/acf/contraption/seats_sv.lua b/lua/acf/contraption/seats_sv.lua
index 4ffe0303b..f96fb8f38 100644
--- a/lua/acf/contraption/seats_sv.lua
+++ b/lua/acf/contraption/seats_sv.lua
@@ -1,5 +1,40 @@
 -- Optional functionality for legality checking on all vehicles
 
+-- A whitelist of allowed seats, prevents setting your seat to something with a microscopic physics object
+local ValidSeatModels = {
+    -- Default HL2 seats
+    ["models/nova/airboat_seat.mdl"] = true,
+    ["models/nova/chair_office02.mdl"] = true,
+    ["models/props_phx/carseat2.mdl"] = true,
+    ["models/props_phx/carseat2.mdl"] = true,
+    ["models/props_phx/carseat3.mdl"] = true,
+    ["models/props_phx/carseat2.mdl"] = true,
+    ["models/nova/chair_plastic01.mdl"] = true,
+    ["models/nova/jeep_seat.mdl"] = true,
+    ["models/nova/chair_office01.mdl"] = true,
+    ["models/nova/chair_wood01.mdl"] = true,
+    ["models/vehicles/prisoner_pod_inner.mdl"] = true,
+
+    -- ACF default seats
+    ["models/vehicles/driver_pod.mdl"] = true,
+    ["models/vehicles/pilot_seat.mdl"] = true,
+
+    -- Playerstart seats
+    ["models/chairs_playerstart/airboatpose.mdl"] = true,
+    ["models/chairs_playerstart/jeeppose.mdl"] = true,
+    ["models/chairs_playerstart/podpose.mdl"] = true,
+    ["models/chairs_playerstart/sitposealt.mdl"] = true,
+    ["models/chairs_playerstart/pronepose.mdl"] = true,
+    ["models/chairs_playerstart/sitpose.mdl"] = true,
+    ["models/chairs_playerstart/standingpose.mdl"] = true,
+
+    -- Racing seats
+    ["models/lubprops/seat/raceseat.mdl"] = true,
+    ["models/lubprops/seat/raceseat2.mdl"] = true,
+}
+
+ACF.ValidSeatModels = ValidSeatModels
+
 hook.Add("OnEntityCreated", "ACF_SeatLegality", function(Entity)
     timer.Simple(0, function()
         if not IsValid(Entity) then return end
@@ -12,7 +47,7 @@ hook.Add("OnEntityCreated", "ACF_SeatLegality", function(Entity)
         Entity.ACF = {}
         Entity.ACF.PhysObj = PhysObj
         Entity.ACF.LegalMass = PhysObj:GetMass()
-        Entity.ACF.Model = Entity:GetModel()
+        Entity.ACF.Model = Entity.VehicleTable.Model or Entity:GetModel()
         Entity.ACF.LegalSeat = true
         Entity.WireDebugName = Entity.WireDebugName or Entity.VehicleTable.Name or "ACF Legal Vehicle"
 
@@ -34,6 +69,17 @@ hook.Add("OnEntityCreated", "ACF_SeatLegality", function(Entity)
     end)
 end)
 
+hook.Add("ACF_IsLegal", "ACF_CheckLegal_SeatLegality", function(Entity)
+    if not ACF.VehicleLegalChecks then return end
+    if not Entity:IsVehicle() then return end
+
+    local ModelPath = Entity:GetModel()
+
+    if not ValidSeatModels[ModelPath] and ModelPath ~= Entity.VehicleTable.Model then
+        return false, "Bad Seat Model", "This seat model is not on the whitelist."
+    end
+end)
+
 hook.Add("CanPlayerEnterVehicle", "ACF_SeatLegality", function(Player, Entity)
     if not Entity.ACF then return end
 
@@ -41,4 +87,4 @@ hook.Add("CanPlayerEnterVehicle", "ACF_SeatLegality", function(Player, Entity)
         ACF.SendNotify(Player, false, "[ACF] Seat is not legal and is currently disabled.")
         return false
     end
-end)
\ No newline at end of file
+end)
diff --git a/lua/tests/acf/core/validation_sv/is_legal.lua b/lua/tests/acf/core/validation_sv/is_legal.lua
index 016ecd1c8..3b551cdfb 100644
--- a/lua/tests/acf/core/validation_sv/is_legal.lua
+++ b/lua/tests/acf/core/validation_sv/is_legal.lua
@@ -19,6 +19,10 @@ return {
                 return true
             end,
 
+            IsVehicle = function()
+                return false
+            end,
+
             GetCollisionGroup = function()
                 return COLLISION_GROUP_NONE
             end