Search radio buttons need a third option for "not used"
Not sure if this is personal preference or not, but on the search pages the radio button defaults should have a 3rd option for "not used" that is null. This allows you to 'un-include' them from a search filter.
<label class="radioSublabel_Narrow" for="SCRUBNAME__1">
<input type="radio" name="SCRUBNAME" id="SCRUBNAME__1" value="1" class="formRadioField_Standard" <?php if (!(strcmp((isset($_GET["SCRUBNAME"])?$_GET["SCRUBNAME"]:""),"1"))) {echo "checked=\"checked\"";} ?>> yes</label>
<label class="radioSublabel_Narrow" for="SCRUBNAME__2">
<input type="radio" name="SCRUBNAME" id="SCRUBNAME__2" value="0" class="formRadioField_Standard" <?php if (!(strcmp((isset($_GET["SCRUBNAME"])?$_GET["SCRUBNAME"]:""),"0"))) {echo "checked=\"checked\"";} ?>> no</label>
<label class="radioSublabel_Narrow" for="SCRUBNAME__3">
<input type="radio" name="SCRUBNAME" id="SCRUBNAME__3" value="NULL" class="formRadioField_Standard" <?php if (!(strcmp((isset($_GET["SCRUBNAME"])?$_GET["SCRUBNAME"]:""),"NULL"))) {echo "checked=\"checked\"";} ?>> not used</label>