check if receiver number have iMessage enabled in apple script?

Question

I am creating an apple script that will send iMessages to some numbers,

I want to check if those numbers have iMessage or not before sending it. How could i achieve that in script editor? The following is the script to send the iMessage

tell application "Messages"
    set theBuddy to buddy "the receiver number here" of service "my service"
    send "Washer Done! :)" to theBuddy
end tell

still need to check if the receiver will be able to receive it or not before sending. Any help?

Regards,