The police report explains what happened after officers and Throckmorton met where the girlfriend lived.
According to that document, Throckmorton also told officers on the scene that “he is an attorney who represents” both Perry and Warner and that Warner “frequently talks about the military and bomb making.”
Throckmorton told the police that “he believes that the suspect knows what he is doing and is capable of making a bomb,” the police report says.
From there, officers went to Warner’s residence at 115 Bakertown Lane, the report says. It describes futile attempts to ascertain additional information:
Police knocked on the door but did not receive an answer. 
Police observed that there was an RV trailer in the back yard but the yard was fenced off and police could not see inside the RV. 
Police also observed that the location has several security cameras and wires attached to a alarm sign on the front door. 
Police attempted several times but could not get the suspect to open the door and police did not have contact with him.
The report says supervisors and other investigatory divisions of the department were notified. No photos were taken.
The officers “saw no evidence of a crime and had no authority to enter the home or fenced property.”
The day after officers had contact with Throckmorton, Perry, and attempted to contact Warner, Nashville Police sent Warner’s information and their narrative report about possible bomb-making activities “to the FBI to check their databases and also determine whether Warner had any prior military connections.”
Later in the day (August 22, 2019) the FBI reported back that they had checked their files and found no records on Warner.
On August 28, 2019, the FBI reported that Department of Defense checks on Warner were all negative.”
During the week of August 26, 2019, the Hazardous Devices Unit made contact with the attorney, Mr. Throckmorton. 
The report states tat “The recollection of that call is that Warner did not care for the police, and that Throckmorton would not allow his client to permit a visual inspection of the RV.”
Legally, it is not unreasonable for an attorney who represents a client who comes under police scrutiny to demand a warrant be issued for such a search.
At no time was there any evidence of a crime detected and no additional action was taken,” the report concludes.  “No additional information about Warner came to the department’s or the FBI’s attention". The ATF also had no information on him.
Throckmorton’s call to the police was governed by Tennessee Rule of Professional Conduct 1.6. 
The Rules of Professional Conduct are legal standards which govern the conduct of attorneys.
The relevant rule generally requires confidentiality. 
It states that attorneys “shall not reveal information relating to the representation of a client” unless the client gives consent, the information is necessary to carry out the representation (e.g., is necessary for a court filing).
However, two key exceptions may apply here. 
The first exception allows (but does not require) attorneys to “reveal information relating to the representation of a client to the extent the lawyer reasonably believes necessary to prevent the client or another person from committing a crime, including a crime that is reasonably certain to result in substantial injury to the financial interest or property of another.”
The second exception is mandatory. 
It states that an attorney “shall reveal information relating to the representation of a client to the extent the lawyer reasonably believes disclosure is necessary to prevent reasonably certain death or substantial bodily harm.”
Tennessee’s professional conduct rules differ from model rules promulgated by the American Bar Association. The ABA’s model rules, which have been codified either in whole or in part by most states, do not require that attorneys reveal information.
Police report is here:
https://www.scribd.com/document/489467592/Anthony-Quinn-Warner-2019-Police-Report#from_embed