diff --git a/apps/api/src/admin/participant_manager.py b/apps/api/src/admin/participant_manager.py
index c0df12cf..b7d69e21 100644
--- a/apps/api/src/admin/participant_manager.py
+++ b/apps/api/src/admin/participant_manager.py
@@ -47,12 +47,16 @@ async def get_hackers() -> list[Participant]:
     return [Participant(**user, **user["application_data"]) for user in records]
 
 
-async def check_in_applicant(uid: str, associate: User) -> None:
-    """Check in applicant at IrvineHacks"""
+async def check_in_participant(uid: str, associate: User) -> None:
+    """Check in participant at IrvineHacks"""
     record: Optional[dict[str, object]] = await mongodb_handler.retrieve_one(
-        Collection.USERS, {"_id": uid, "role": Role.APPLICANT}
+        Collection.USERS, {"_id": uid, "role": {"$exists": True}}
     )
-    if not record or record["status"] not in (Status.ATTENDING, Status.CONFIRMED):
+
+    if not record or record.get("status", "") not in (
+        Status.ATTENDING,
+        Status.CONFIRMED,
+    ):
         raise ValueError
 
     new_checkin_entry = (utc_now(), associate.uid)
diff --git a/apps/api/src/routers/admin.py b/apps/api/src/routers/admin.py
index 01f4bef5..b757c64f 100644
--- a/apps/api/src/routers/admin.py
+++ b/apps/api/src/routers/admin.py
@@ -253,13 +253,12 @@ async def participants() -> list[Participant]:
 
 
 @router.post("/checkin/{uid}")
-async def checkin(
+async def check_in_participant(
     uid: str, associate: Annotated[User, Depends(require_checkin_associate)]
 ) -> None:
     """Check in participant at IrvineHacks."""
     try:
-        # TODO: non-hackers
-        await participant_manager.check_in_applicant(uid, associate)
+        await participant_manager.check_in_participant(uid, associate)
     except ValueError:
         raise HTTPException(status.HTTP_404_NOT_FOUND)
     except RuntimeError as err: