diff --git a/backend/app/routers/puck.py b/backend/app/routers/puck.py
index accdde4..cff0801 100644
--- a/backend/app/routers/puck.py
+++ b/backend/app/routers/puck.py
@@ -145,6 +145,7 @@ def get_pucks_at_beamline(slot_id: int, db: Session) -> List[PuckWithTellPositio
             PuckModel,
             PuckEventModel.event_type,
             PuckEventModel.tell_position,
+            PuckEventModel.timestamp,  # Useful for debugging or edge cases
             DewarModel,
         )
         .join(
@@ -163,36 +164,41 @@ def get_pucks_at_beamline(slot_id: int, db: Session) -> List[PuckWithTellPositio
         )
         .join(DewarModel, PuckModel.dewar_id == DewarModel.id, isouter=True)
         .filter(PuckModel.dewar_id.in_(dewar_ids))
+        .distinct()  # Ensure no duplicates
         .all()
     )
 
     # Prepare the results
-    results = []
-    for puck, event_type, tell_position, dewar in pucks_with_latest_events:
-        dewar_name = dewar_map.get(puck.dewar_id, "Unknown")
+    results = {}
+    for (
+        puck,
+        event_type,
+        tell_position,
+        event_timestamp,
+        dewar,
+    ) in pucks_with_latest_events:
+        dewar_name = dewar_map.get(puck.dewar_id)
         pgroup = dewar_pgroups.get(puck.dewar_id)
 
-        # For pucks with no events or whose latest event is "puck_removed", set
-        # tell_position to None
+        # If the event is None or explicitly a "puck_removed", set `tell_position=None`
         if event_type is None or event_type == "puck_removed":
             tell_position = None
 
-        results.append(
-            PuckWithTellPosition(
-                id=puck.id,
-                pgroup=pgroup,
-                puck_name=puck.puck_name,
-                puck_type=puck.puck_type,
-                puck_location_in_dewar=int(puck.puck_location_in_dewar)
-                if puck.puck_location_in_dewar
-                else None,
-                dewar_id=puck.dewar_id,
-                dewar_name=dewar_name,
-                tell_position=tell_position,
-            )
+        # Always replace results since we are processing the latest event
+        results[puck.id] = PuckWithTellPosition(
+            id=puck.id,
+            pgroup=pgroup,
+            puck_name=puck.puck_name,
+            puck_type=puck.puck_type,
+            puck_location_in_dewar=int(puck.puck_location_in_dewar)
+            if puck.puck_location_in_dewar
+            else None,
+            dewar_id=puck.dewar_id,
+            dewar_name=dewar_name,
+            tell_position=tell_position,  # Respect if `None` is explicitly set
         )
 
-    return results
+    return list(results.values())
 
 
 @router.get("/", response_model=List[PuckSchema])
@@ -269,7 +275,7 @@ async def set_tell_positions(
                         tell=None,  # Nullify the `tell` for removal
                         tell_position=None,
                         event_type="puck_removed",
-                        timestamp=datetime.utcnow(),
+                        timestamp=datetime.now(),
                     )
                     db.add(remove_event)
 
@@ -309,9 +315,8 @@ async def set_tell_positions(
         puck.id: db.query(PuckEventModel)
         .filter(
             PuckEventModel.puck_id == puck.id,
-            PuckEventModel.event_type == "tell_position_set",
         )
-        .order_by(PuckEventModel.timestamp.desc())
+        .order_by(PuckEventModel.id.desc())
         .first()
         for puck in pucks_at_beamline
     }
@@ -358,7 +363,7 @@ async def set_tell_positions(
                     tell=None,
                     tell_position=None,
                     event_type="puck_removed",
-                    timestamp=datetime.utcnow(),
+                    timestamp=datetime.now(),
                 )
                 db.add(remove_event)
 
@@ -368,7 +373,7 @@ async def set_tell_positions(
                 tell=tell,
                 tell_position=new_position,
                 event_type="tell_position_set",
-                timestamp=datetime.utcnow(),
+                timestamp=datetime.now(),
             )
             db.add(new_event)
 
@@ -409,7 +414,7 @@ async def set_tell_positions(
                         tell=None,
                         tell_position=None,
                         event_type="puck_removed",
-                        timestamp=datetime.utcnow(),
+                        timestamp=datetime.now(),
                     )
                     db.add(remove_event)
                     results.append(
@@ -436,13 +441,23 @@ async def set_tell_positions(
 
 
 @router.get("/with-tell-position", response_model=List[PuckWithTellPosition])
-async def get_pucks_with_tell_position(db: Session = Depends(get_db)):
+async def get_pucks_with_tell_position(
+    tell: str,  # Specify tell as a query parameter
+    db: Session = Depends(get_db),
+):
     """
     Retrieve all pucks with a valid `tell_position` set (non-null),
-    their associated samples, and the latest `tell_position` value (if any).
-    Only include pucks when their latest event has a `tell_position`
-    set and an `event_type` matching "tell_position_set".
+    their associated samples, and the latest `tell_position` value (if any),
+    filtered by a specific `tell`.
     """
+    # Validate the incoming `tell` value
+    try:
+        validate_tell(tell)  # Ensure `tell` is valid using predefined valid options
+    except ValueError as error:
+        raise HTTPException(
+            status_code=400, detail=str(error)
+        )  # Raise error for invalid tells
+
     # Step 1: Prepare a subquery to fetch the latest event timestamp for each puck.
     latest_event_subquery = (
         db.query(
@@ -471,6 +486,7 @@ async def get_pucks_with_tell_position(db: Session = Depends(get_db)):
         .filter(
             PuckEventModel.event_type == "tell_position_set"
         )  # Only include relevant event types
+        .filter(PuckEventModel.tell == tell)  # Filter by the specific `tell` variable
         .all()
     )
 
diff --git a/pyproject.toml b/pyproject.toml
index e7e554c..5be7d25 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "aareDB"
-version = "0.1.0a20"
+version = "0.1.0a21"
 description = "Backend for next gen sample management system"
 authors = [{name = "Guillaume Gotthard", email = "guillaume.gotthard@psi.ch"}]
 license = {text = "MIT"}