The law is very clear as to what can be sold as pure maple syrup; only the liquid derived by concentration and heat treatment of the sap of the maple tree. No processing that adds or removes naturally occurring soluble materials is allowed. This does not, however, include the use of approved filter-aids for the removal of suspended material such as sugar sand or niter or the use of approved defoamers. Unfortunately, the relatively high price of pure maple syrup can provide the incentive for illegal adulteration with non-maple sugars and or artificial decolorizing agents. This is quite rare and several analytical methods are available to detect the addition of other types of sugars in pure maple syrup. Monitoring is conducted by both the maple industry and governmental organizations to detect any illegal products and remove them from the marketplace. A case from 2011 brought to court by the US Food and Drug Administration when a sample of syrup was tested and determined to be 100% cane sugar proves that the laws can and will be enforced.