Re: prenup...
In US, the judge will look at the prenup but will also consider heavily all of the circumstances surrounding the marriage, the length of the marriage, the impact of divorce etc etc. Thats the reason that many pre-nups fail to hold up in court. Ie., the guy who was married for only one year and now has to pay for the ex-wife's education....well the judge is going to look at the gal - if she's "divorced" she'll be less able to find herself another spouse, she hasnt yet completed her education and so cannot earn a decent living. If she completes her education - at the expense of the ex-hubby - she'll be much less liable to become a welfare burden. If you want a pre-nup, consider each and every possibility and make it like a flawless flow-chart with if-then-else which encompasses every possible situation. Thats the only way you can have a small chance of having it hold .... but even then, circumstance weighs as heavily as the pre-nup.
as far as poisoning the food etc thats what happens over "there" in Desi-land with the "kitchen accidents" yeah?
as always, my best advice is to KNOW WELL what you're getting yourself into! Know well the expectations, desires, wants and needs of a prospective spouse and make sure you're both mature enough that all of these things arent still in that ever-changing emergent state.