kma371 is correct, the complete policy statement from the EBRCSA web site, states:
A. POLICY STATEMENT
The EBRCSA system allows encryption of voice traffic. There are two options available to provide
encryption. Motorola Solutions offers an option called Advanced Digital Privacy (ADP) which is a
proprietary form of encryption that only works on Motorola subscriber unit. The Advanced Encryption
Standard (AES) is the nationally accepted standard for encryption and is available for use on all vendor
subscriber units.
The EBRCSA adopted the following policy:
1. Establish three (3) system wide Talk Groups to be used for encryption;
2. Establish that system users standardize on Advanced Encryption Standard (AES) if encryption is used;
3. Encryption should be an agency by agency decision;
4. Encryption should be confined to special operations and not used on primary dispatch talkgroups.
The document can be found on their site (I'm using a shortened URL)
http://goo.gl/VQnHxF
As usual, when there is an "authority" involved, aka GOVERNMENT, then you will find that their policy items typically conflict within the same policy or with other policies. You will also notice the overabundant use of the one or more of the 4 deadliest words known in the English language. In this case it is the word SHOULD.
The 4 deadliest words are:
SHOULD
COULD
WOULD, and...
IF
Translation: should does not equal SHALL, therefore, the policy has no authority over any agency for items 3 & 4. SHOULD is simply a loose way to ensure that the "authority" is not the one "laying down the law" on how the EBRCS is used so that they cannot be held liable for something later on.
Yes, they do think about these things, a lot, and, with a lot of lawyers to protect their butts.