Index: trunk/ippTools/src/chiptool.c
===================================================================
--- trunk/ippTools/src/chiptool.c	(revision 29902)
+++ trunk/ippTools/src/chiptool.c	(revision 30049)
@@ -271,7 +271,8 @@
 
     // default
+    PXOPT_LOOKUP_BOOL(unique, config->args, "-unique", false);
     PXOPT_LOOKUP_BOOL(pretend, config->args, "-pretend", false);
     PXOPT_LOOKUP_BOOL(simple, config->args, "-simple", false);
-
+    
     // find the exp_id of all the exposures that we want to queue up.
     psString query = pxDataGet("chiptool_find_rawexp.sql");
@@ -288,4 +289,8 @@
     psFree(where);
 
+    if (unique) {
+      psStringAppend(&query, "AND chip_id IS NULL");
+    }
+    
     if (!p_psDBRunQuery(config->dbh, query)) {
         psError(PS_ERR_UNKNOWN, false, "database error");