How duffer can he be?
The first thing any rats dimagwala policeman would do is- take letter ++ Envelope.
Check where it came from!
AND
use the Mature samajhdar Common Sense, and one+one= 1.47 enlightens connection of VayadiVahini's random call & letter.
What can be tomorrow onwards?
a. ACP redeems himself (are we supposed to guess from those looks he keeps giving while listening to khandan, that he gets their fakery?)- He checks cctv & catches Didi planting the letter! - maybe that's what he is showing to Sai?
b. From tellychakkar's article -could be that Bhavani's minion devar hired a lavani dancer to pretend she is Pulkit's wife? and drama goes on- as ACP is brain gets foggy all the time! Won't do any investigation/ background check - anything! Dhoom -Dhadam- and Sai out!
Creatives need to add more creativity in ACP's character... is going downhill in kanooni matters.
Khadoos Jassos needs to live up to his reputation!