Is the pulse polio programme effective ?

We have seen over the last few years, that every few months or so there is this "Pulse Polio" programme in which kids below the age of 5 are supposed to be given two drops of the polio vaccine, so that polio can be eradicated. This is a good move and looking by the way the publicity is done for it and the way the information of the dates (usually a Sunday) is spread, I dont think there might be any kids who might be left out. Volunteers spam the slums too in addition to making door to door visits, looking for kids. Its free, so people are not hesitant to come forward. All this is rather good. Public money well spent, for a change.

But ...

Is the polio vaccine thats given really effective ? Does it guarantee that the kid wont get polio ? Is there any siphoning off the vaccine and maybe replacing it with coloured water ? In our country nothing can be ruled out - its a place where religon is also raped for money.

I say this because today at T-junction I saw a small (maybe 3/4 year old girl) in a school uniform - wating for her bus or something. And she had polio. Crutches and all. The kid looked as if it was from a decent background. It was rather dissapointing. Has anyone made any check on the outcomes of this pulse polio programme ? Is it just a way to gain publicity ? How many polio cases get reported (there will be more obviously) - and if so why ? Why should even one kid get it. Or is it that the vaccine doesnt guarantee eradication ? If so its a rather very rude sham.