The US national, whose computer Internet connection was used to send terror e-mail minutes before Ahmedabad blasts, left the country on Monday despite a look out notice issued by Mumbai police.
Ken Haywood, who underwent lie detector and brain mapping test, fled from the Indira Gandhi International Airport in the wee hours on Monday to the US.
Mumbai Police has blamed its Delhi counterparts for the goof up as he was allowed to pass the immigration despite a Look Out notice being issued against his name, official sources said.
They said he had cleared all tests but had been summoned by the Anti-terrorist squad of the Mumbai police following his allegation that a senior police official had demanded a bribe from him.
He did not turn up before the ATS despite summons, they said, adding a thorough enquiry would only lead to fixing of the responsibility for the goof up.
CEO of a multi-national company in the country's commercial capital, Haywood was questioned several times after the Internet Protocol address of Indian Mujahideen mail, sent to various media houses minutes before Ahmedabad blasts, led to his flat in Navi Mumbai.
The entire building had a Wireless Fidelity (WiFi) with Haywood being one of the users. He had claimed that his connection, which was not password protected, was used by the terror group to send the email.
Gujarat Police is already on a look out for a techie, who was working with Wipro company, as they claim that he could have possibly hacked his Internet connection.