Trigger after insert on two tables - tsql

Question

I have the following trigger right now but I now have the requirement to only kick off the trigger if ANOTHER table Facility has a record inserted into it with a LocationID = 'ER'-
As per the comment I've updated the trigger -
ALTER TRIGGER [dbo].[VoceraOeOrders] ON [dbo].[OeOrders]
FOR INSERT
AS
IF NOT EXISTS (
SELECT *
FROM dbo.Facility
WHERE LocationID = 'ER'
)
RETURN
DECLARE #priority VARCHAR(50)
DECLARE #cat VARCHAR(50)
DECLARE #order VARCHAR(50)
DECLARE #procedure VARCHAR(50)
DECLARE #orderid VARCHAR(50)
DECLARE #locationid VARCHAR(10)
DECLARE #roomid VARCHAR(10)
DECLARE #visitid VARCHAR(50)
SELECT #visitid = VisitID
,#priority = Priority
,#cat = Category
,#procedure = OrderedProcedureName
,#order = OrderDateTime
,#orderid = OrderNumber
,#locationid = (
SELECT LocationID
FROM dbo.Facility
WHERE VisitID = #visitid
)
,#roomid = (
SELECT CASE
WHEN RoomTreatmentID IS NULL
THEN 'No Room#'
ELSE RoomTreatmentID
END
FROM dbo.Facility
WHERE VisitID = #visitid
)
FROM insterted
WHERE #priority = 'STAT'
AND #cat IN (
'CT'
,'MRI'
,'XRAY'
,'US'
,'RT'
,'NUC'
,'ECHO'
)
BEGIN
DECLARE #msg VARCHAR(500)
DECLARE #subject VARCHAR(500)
SET #msg = #procedure + ' - ' + #locationid + ' ' + #roomid + '-' + ' Priority ' + #priority + '.' + 'Order DateTime/Number ' + #order + '/' + #orderid
SET #subject = 'Vocera Group Name Here'
EXEC msdb.dbo.sp_send_dbmail #recipients = N'some_email'
,#body = #msg
,#subject = #subject
,#profile_name = 'Alert'
END

Answer 1

Just add in the beginning of you trigger:
if not exists(select * from facilities where FacilityID = 'ER')
return
You can't stop kicking trigger. You can check for some condition and return from trigger.