obtain permission from DHS
The act of secretly listening/watching/surveying someone is called 'surveillance'. If you are listening in on a private conversation, it could be said that you are keeping a surveillance over them. However, there is another word for listening in on a conversation you are not a part of - and that is eavesdropping. It means to hang nearby and listen in without them being aware of you presence.
Covertly
It depends on the situation and it depends on the jurisdiction. I will answer as a PI in Georgia. It is legal in Georgia to record a conversation if you are a party to the conversation. So the phone call could be recorded if the PI or the PI's client (or another consenting party of the conversation) gives their permission. It is illegal for anyone (PI or not) to record a convesation if they are not a party in that conversation.
There are 12 States in the U.S. That requires ALL parties involved in the conversation (All Party Consent) to be made aware that the conversation is being recorded. These States are:CaliforniaConnecticutDelawareFloridaIllinoisMarylandMassachusettsMichiganMontanaNew HampshirePennsylvaniaWashingtonThe following 38 States require that at least ONE person (One Party Consent) involved in the conversation has given permission for the conversation to be recorded including the person doing the recording:AlaskaArkansasColoradoDistrict of ColumbiaGeorgiaHawaiiIdahoIndianaIowaKansasKentuckyLouisianaMaineMinnesotaMississippiMissouriNebraskaNevadaNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWest VirginiaWisconsinWyomingThis falls under the United States Code: Title 18.2511. As long as you actually take part in the conversation and are doing so in a State that allows "One Party Consent", it is quite legal to record the conversation without another party in the conversation giving permission or even being told that they are being recorded.Hope that fully answers your question..
Disclose, make a pronouncement...
conversation or communication
show, uncover
conversation
by permission from author and publisher
a salesperson from one realty company purchases property from another realty co. and did not disclose to the seller that he is a agent with another company, what license law violation did he commite
looking at someone secretly with out then knowing or a noob