HIV testing

Recently when i spoke to HIV testing centers in US
I know ELISA after 3 months is conclusive
But my questions is  
are this facts what they told me are true
1. 50% of people who get -ve result in Elisa after 6 weeks , can get +ve after 12 weeks test
2. PCR DNA test after 28 days is negative you dont have to go for ELISA after 12 weeks
3 .PCR DNA has high false positive also

Can you please explain this three scenarios

[Teak]

Wrong. PCR-DNA testsing is not approved in the US. MOVE ON.

[rakesh675]

What about Elisa after 6 weeks teak ?

[Teak]

3 months to obtain a conclusive test and has been since 2004.