I'm Malaysian and I'm holding Thai Non O visa because follow husband and is my first extention in the Immigration dept . I just want to know that in the Immigration dept, the police dept still investigate my status and ask me come back one months after to get the result of the extention. I just wonder this time can I go there without my husband to get the result alone.

Please advise

Yes you should be able to get the extension of stay (result) alone. Just bring your passport and enter it into the queue system and then come back at the designated time. If this was done at room 101 in Suan Plu you do not have to obtain a queue number at main desk - just go to room and there will be a table and basket on right entry side where you attach a queue number to your passport and put in basket.