Power of lawyer

lawyer can investigate the case?

or

 lawyer can inquiry the case?

under which law or sec can do 

lawyer has to understand the case entirely for that he has to collect as much information he can  in regards to that case . so that he can fight that case.

sir i understand that thing but sir my question is they have power to invetigate the case as police officer do or they just they can inquiry 

they can only inquire  but dont have any particular power to investigate a case. .Investigaton can be done by police authoritiies or people who have been given such power .

In your question itself you are mentioning police officer, then I don't know why you are asking such a question , But as for as civil cases concerns the advocate may be appointed as commissioner to know the truth of the case. As for as criminal case concern, it is much different

Lawyers have no Power to Investigate any case as Police Officer

They can only represent a party in a Court of Law and except for this they are just as ordinary a cirtizen as you and me

To represent a person teh Lawyers can make enquiries about the issues realted to the case but they do not enjoy any special Powers to make such enquiries and  they will do that only under teh General Rules available to any other citizen (However in practice, teh Govt Employees, Officers, Police etc willl  not play foul with teh lawyers and will provide them the same information with much more ease as comapred to an ordinary citizen "Jiske ghode khul jaate hain ek thodi see jankaar lene mein"

However in practice the Lawyers enjoy lot of Social Powers and Status which are not available to an ordinary person 

For Example

No one will eaasily get into a quarrel with a lawyer easily unless the Lawyer has done something extremely serious

"Lawyers Se Koi jadli panga nahi leta hai aur bach ke chalne me hi bhalai saamajhta hai"

With the sticker of Lawyer on the car soem parking people will not even charge teh parking fee (You and may even be overcharged)

Any person in the Society including the Police will take special precaution to  ensure that they  do not use their "Special Language" while talkimng to a lawyer

The list is endless

Then there are certain negative effects also of being a lawyer

1.The landlords will not easliy give you their premises on rent

2.Some Banks will not give loans to Lawyers and will not accept their guarantees for other borrowers

3. Many Banks have put Lawyers in Negative List in the Credit Cards

thank u sir for ur valuble information i have posted this question bcoz has i am a lawyer and i have open the firm of "Top cyber crime investigation" should i use word inquiry or investigation or private investigation, but i have one case of  i am pasting here