Can a rape suspect be charged after 4 years, and victim can prove with poly and any other necessary things?

The usual statute of limitations for rape is 7 years but it varies by jurisdiction.

The polygraph will not be accepted as evidence in a criminal trial, there will need to be some other evidence linking this man to the crime.

The answer to it is YES the victim can still charged the suspect of rape after 4 years since the time allocated by law for the crime is 5 years it varys from one place to another. So the law gives the victim ample time to file the case within these perimeters.

No need the poly test the medical examination is sufficient enough to prove to the court that the girl was indeed rape what is the use of the poly for the girl? Maybe for the suspect be these isn't the idea for rape cases, evidence and witnesses is enough to put the guy in jail. Why? You are the guy in these situation? Just asking.

You didn't say where you are from. Laws are different from state to state and from country to country.

In Australia there is no limit of time for a criminal offence (rape, murder...and all of the other "criminal" offences etc...). So it could still go to court. You didn't say how old the girl was? If she is under 16 whether she consented or not it will still be rape.

Polygraph may not necessarily be admitted into the court as evidence (once again depending on which country you live in).

Rape cases are horrible and the rapist often gets let off because it's usually their word against the victims and the jury will have to decide beyond a reasonable doubt that he is guilty for him to actually be considered guilty.

She should report it. The sooner the better.

A polygraph may indicate that she is being truthful about the event, however, the results of a polygraph are inadmissible as evidence.

Unless there is strong physical evidence to support her story then there is a chance the suspect could walk. Typically, the staute of limitations is 7 years, but that may vary depending on the jurisdiction.

Another issue to consider is whether or not the District Attorney would actually pursue the case after so long for any number of reasons. Your friend should speak with an attorney.

While passing a polygraph test may give the cops enough ammo to start an investigation, it's results are not allowed in court. Since this happened so long ago, it'd be impossible for there to be any forensic evidence, so short of witnesses, their case would rely almost exclusively on pressing this guy and getting a confession. This is why rapes should be reported immediately.

It is very hard to convict anyway, let alone four years on, but it is worth a try. I hope she is successful

This polygraph thing makes me sick, only 2% of women lie and that is of all those that have reported so why do they always suspect the woman of lieing.

the answer is yes - the suspect can be charged and prosecuted BUT

The local police and DA will look at the evidence to support a possible prosecution before charging someone (they will be unlikely to charge someone unless they think they might be able to successfully prosecute)

After 4 years I am not sure unless there would be sufficient physical evidence and reliable witnesses

That said if there was a rape she should go to the police and report it