Texas has a lot of weird laws most other states do not follow.You're right, laws do vary by state, but if you win a judgement, they are usually on your side.

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It could vary from relatives info, historical addresses, social media activity, past phone/email addresses, ect.

Splits vary per deal and per situation but 50% - 70% going to partners is typical.We are regulated to death and it is only getting worse, most of which is a claim to protect consumers, I don't see how that is true, but that is just opinion.I still stand firm on my belief that having the ability to pay all involved so that nobody other than you loses money is key.

The amount a tenant will ask for varies greatly all over the city.

Looking at it in this way will keep you safe and within the regulations of the IRS (especially as a SDI is concerned.Second, there are three major categories of rules in regards to an SDI. 1.

Anyone can disparage anyone else, or tarnish a company's reputation, without cause or supporting evidence... and do so without public consequence as a result of being able to post anonymously or with a made-up name.If posters were somehow grouped (perhaps using banking, credit card, or paypal info) into "identity verified" and "identity unconfirmed" categories and shown as such in their posts, we'd have something meaningful with which to judge their disparaging comments... since verified users run the risk of having to defend their actions in civil court.It's a shame that mankind has yet to (and probably never will) transcend beyond the knee-jerk reaction of name-calling and lumping every personal experience as the "only kind of experience others could possibly have" with a company or product.  

The law might vary from state to state, so you need a state specific answer.

Does it vary more by area (of the country), or just contractor to contractor?

My guess is that the specific legal terms vary from state to state (with the different standard Listing Agreement contracts).