I agree with Mr. Jones. It looks like you are hoping someone can give you an okay to smoke marijuana while on house arrest. Consider yourself having been lucky. I have also seen situations in which a person does not get violated on their first marijuana, since it does stay in your system so long. Don't risk it.
This is not intended as individual legal advice and there is no attorney client relationship established by this answer. It is advisable that you seek individualized legal assistance. This is not a substitute for hiring an attorney.
Your PO can test you for drugs or alcohol at any time up to your release. As you say, lay off of any illegal substances. If you do not, and you get caught and violated, it will be the most expensive bowl or joint you ever smoked.
In addition to the correct responses provided by the other attorneys, I strongly recommended that you avoid posting incriminating statements online. While your name is not listed, the source would not be too difficult to trace, at the very least if your PO or other POs in your area see your posting they likely will come down hard on everyone.