Snapshot Isolation not Taking Affect

Although the stored procedure sets snapshot isolation to on with the following line:

SET TRANSACTION ISOLATION LEVEL SNAPSHOT;

The queries that are run in this stored procedure return data that was modified during the execution. The queries behave as if they were running under the read uncommitted isolation level.

The issue seems to be related to settings since in other environments, running the same schema and stored procedure code, we did not see this behavior. The database is a running SQL Server 2008 R2 with snapshot isolation enabled.

Any help on this will be much appreciated.

Thank you,

Ephraim Shurpin