In a recent announcement, the Indonesian National Police spokesman Insp. Gen Argo Yuwonosaid that the Indonesian police will provide sign language interpreters during police conferences to assist the disable and bridge the communication barriers.
In the US, the famous NYC sign language has been in the news quite often.
For more reference on sign language interpreter please go to these links:
The Inasli Jakarta Website
The WASLI website
wasli.org
The Federal Association of Interpreters and Translators (Bundesverband der Dolmetscher und Übersetzer e.V., BDÜ) profile. Their website is below (click on the photo to go to the website)