Major media, and experts (like Structure Engineer Association) say that any building's chlorine ion content (cl)  exceeding  0.3kg/m³ is called a Sea Sand house,  but some seller still hire his own architects trying to change the standard.   For instance, one post 0.25kg/m^{3 ,} another 0.33kg/m³ , in one case the courts disagree  engineer's opinion and determine it is a sea sand house,  it is a right decision - for safety's sake.      
(  The Taiwanese architects made quite a lot incorrect determinations  in 921 earth-quake event, one of the most horrible quakes in the world.   Sea sand house is one cause of this event.  )

 Major media and experts said Cl. (chlorine ion content) of river sand is supposed to be about 0.03 or 0.04 kg/m³, far less than National Standard value 0.3 kg/m³.  If the court sticks to normal value 0.3 in all cases, there will be no grey zone to play games.

 (2) The government recommends The Industrial Tech. Research Institute of Taiwan to be best detection unit, but they probably won't go to the building to take samples, so that the seller may attack those concrete samples consumers brought to ITRI are fake ones. (investigation works?  or you need seller's agreement in advance )

 On the other hand,  Detection report can be fake one, if your rivals are related or inside this circle (a real-estate expert attorney told me that) .

 Actually, according to top-level scholarly/academic periodical(土木水利) of 2006, many many fake reports're made in Taiwan. - "They are just like thieves !!"

 (3) The government also suggests you to have safety test by Civil Engineers assoc., Structure Eng. Assoc., Architects Assoc., Industry skill academy.   The seller's lawyer may still attack some Labs of those organizations are not qualified accredited ones.  

 (4) Some attorney warned that a number of lawyers may play games and take advantages or benefits from both sides.  Are some judges co-players or ....? I've heard some things  for a long time, but till 8/12/2006, I don't know if it is true.

 (5) I saw certain case the debate "misled" the buyer by tech. knowledge that I believe ordinary people certainly don't know at all.

 (6) The test results may differ a lot (look back related law-cases, huge difference may up to 20 times between 2 tests) ,   So, you'd better to detect as many samples as possible all over the house (particularly, old house), and hire 2 or more units to do the examinations for safety .

 (7) According to the Supreme Court and Taipei Court etc statements, all buy-and-sell house deals after 1998 should obey the standard - 0.3 kg/m^3 .  Do all judges follow the rules?  any variables out there ? Taiwan real estate agents including largest one, Sinyi, always suggest (by salespersons) or take old value 0.6 as default standard for old buildings.     .......  (ask an attorney for more details)

(1) Free consultations are offered in some university Law schools, like

 National Taiwan University: you may register  a consultation every Saturday afternoon, or
 Taipei University, every Wednesday afternoon.

(2) Free consultation in some other places like Taipei City Hall (phone-call in advance), and gov districts.

(3) Some attorneys offer free initial consultations.

Be careful to select a good attorney, some may take your consultation fee, and give you a shit.   Some attorneys won 80% of his law-cases may not be a right  lawyer for you, it depends what case he/she won, and his/her personality.

 A "Law Expert" professor in best university suggest you to choose a lawyer you know . 

ps: I interviewed with 丁俊文(attorney for Formosa political event), 林美倫(former Taipei City congresswoman), 王建智(exe. attorney for largest real-estate company Sinyi) etc, they did offer free consultations for a few times. (sort of zealous)

 ( to be continued if any spare time , all will be modified in more details )