Looking through my taint.log level 2 file, I noticed several entries for Dominos.

1/4 11:09:26.797 Execution tainted by Dominos while reading DominosCastingBarSpark - Interface\FrameXML\CastingBarFrame.lua:75 CastingBarFrame_OnEvent()
1/4 11:09:26.797 Interface\AddOns\Dominos_Cast\castBar.lua:139
1/4 11:09:26.797 CastSpellByName()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:1084 ?()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:4273 ChatEdit_ParseText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:3992 ChatEdit_SendText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:2704
1/4 11:09:26.797 UseAction()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:275 handler()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:561 SecureActionButton_OnClick()
1/4 11:09:26.797 Interface\FrameXML\ActionButton.lua:28 ActionButtonDown()
1/4 11:09:26.797 ACTIONBUTTON3:2

1/4 11:09:26.797 Execution tainted by Dominos while reading DominosCastingBarText - Interface\FrameXML\CastingBarFrame.lua:76 CastingBarFrame_OnEvent()
1/4 11:09:26.797 Interface\AddOns\Dominos_Cast\castBar.lua:139
1/4 11:09:26.797 CastSpellByName()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:1084 ?()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:4273 ChatEdit_ParseText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:3992 ChatEdit_SendText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:2704
1/4 11:09:26.797 UseAction()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:275 handler()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:561 SecureActionButton_OnClick()
1/4 11:09:26.797 Interface\FrameXML\ActionButton.lua:28 ActionButtonDown()
1/4 11:09:26.797 ACTIONBUTTON3:2

1/4 11:09:26.797 Execution tainted by Dominos while reading DominosCastingBarFlash - Interface\FrameXML\CastingBarFrame.lua:77 CastingBarFrame_OnEvent()
1/4 11:09:26.797 Interface\AddOns\Dominos_Cast\castBar.lua:139
1/4 11:09:26.797 CastSpellByName()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:1084 ?()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:4273 ChatEdit_ParseText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:3992 ChatEdit_SendText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:2704
1/4 11:09:26.797 UseAction()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:275 handler()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:561 SecureActionButton_OnClick()
1/4 11:09:26.797 Interface\FrameXML\ActionButton.lua:28 ActionButtonDown()
1/4 11:09:26.797 ACTIONBUTTON3:2

1/4 11:09:26.797 Execution tainted by Dominos while reading DominosCastingBarBorder - Interface\FrameXML\CastingBarFrame.lua:79 CastingBarFrame_OnEvent()
1/4 11:09:26.797 Interface\AddOns\Dominos_Cast\castBar.lua:139
1/4 11:09:26.797 CastSpellByName()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:1084 ?()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:4273 ChatEdit_ParseText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:3992 ChatEdit_SendText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:2704
1/4 11:09:26.797 UseAction()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:275 handler()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:561 SecureActionButton_OnClick()
1/4 11:09:26.797 Interface\FrameXML\ActionButton.lua:28 ActionButtonDown()
1/4 11:09:26.797 ACTIONBUTTON3:2

1/4 11:09:26.797 Execution tainted by Dominos while reading DominosCastingBarBorderShield - Interface\FrameXML\CastingBarFrame.lua:80 CastingBarFrame_OnEvent()
1/4 11:09:26.797 Interface\AddOns\Dominos_Cast\castBar.lua:139
1/4 11:09:26.797 CastSpellByName()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:1084 ?()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:4273 ChatEdit_ParseText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:3992 ChatEdit_SendText()
1/4 11:09:26.797 Interface\FrameXML\ChatFrame.lua:2704
1/4 11:09:26.797 UseAction()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:275 handler()
1/4 11:09:26.797 Interface\FrameXML\SecureTemplates.lua:561 SecureActionButton_OnClick()
1/4 11:09:26.797 Interface\FrameXML\ActionButton.lua:28 ActionButtonDown()
1/4 11:09:26.797 ACTIONBUTTON3:2

I think this bit of taint is harmless