Despite all the studies and technical tests available, forgeries will still be made. The 20th-century art forger is far better equipped and much more knowledgeable than his predecessor. The demand for rare works of art has increased, and he will attempt to supply them. In collecting, whether by the private collector or by a museum, there comes a point when, after all the studies and all the tests are conducted, a decision has to be made as to whether or not to purchase a piece in question. The element of risk can be minimized but not eliminated. At this point, the collector should be ready to back his opinion with the purchase price. In order to acquire great pieces, particularly from newly discovered and relatively unknown cultures, it is necessary to take a calculated chance. The collector who has never bought a forgery probably has never bought a great piece of art.
Seed provenance refers to the specified area in which plants that produced seed are located or were derived. Local provenancing is a position maintained by ecologists that suggests that only seeds of local provenance should be planted in a particular area. However, this view depends on the adaptationist program – a view that populations are universally locally adapted.[63] It is maintained that local seed is best adapted to local conditions, and that outbreeding depression will be avoided. Evolutionary biologists suggest that strict adherence to provenance collecting is not a wise decision because:
When addressing the efforts to establish an artwork’s provenance history and authenticity under Guideline 4, the AML Guidelines provide that “[i]t is important to obtain and publish in any catalogue or sales document as much information as possible about the artwork, including any known provenance,” and to “check major databases of stolen and looted art and obtain any relevant and available legal documents, witness declarations, [and] expert opinions[.]” In addition to a physical examination of the artwork and a technical analysis and dating of the materials used, “[d]ocuments helpful in establishing ownership and provenance include invoices, receipts, dated photographs, insurance records, valuations, official records, exhibition catalogues, invoices for restoration work, diaries, dated newspaper articles, original signed and dated letters.”
Stories of art and money laundering tend to be media friendly, and often involve the wealthy behaving poorly.  In one notorious case, the Department of Justice (“DOJ”) seized, via a civil forfeiture action, Jean Michel Basquiat’s 1981 painting, Hannibal. This work — later returned to Brazil by the DOJ — had been smuggled into the U.S. by Edemar Cid Ferreira, a former Brazilian banker who was convicted of money laundering and other offenses, and who allegedly converted some of his laundered proceeds into a significant art collection.  According to the DOJ, although Hannibal had been appraised at a value of $8 million, it had been smuggled by Ferreira into the U.S. from Brazil, via the Netherlands, with false shipping invoices stating that the contents of the shipment were worth $100.  Other stories provide less genteel tales of drug cartels, terrorist organizations and other criminal syndicates financing themselves through systemic looting and the illicit antiquities trade.
— The United Nations Office on Drugs and Crime estimates the amount of illicit money that is laundered each year to be between “2 - 5% of global GDP, or $800 billion - $2 trillion in current US dollars.” The difficulty of knowing exact figures accounts for the huge margin within estimates. The UN’s estimates specifically cite “Mega-Byte” as an issue, defining the term as “money in the form of symbols on computer screens the can move anywhere in the world with speed and ease.”
Recently an art dealer faced a claim that the provenance he provided with a painting was incomplete because it did not include all of the owners going back to the artist. According to the disgruntled buyer, this omission was material because the provenance included a gallery involved in a well-publicized forgery scandal and, therefore, the painting would be hard to re-sell at an appropriate price without a verifiable provenance going back to the artist. Significantly, the painting had been sold at auction a decade earlier and the dealer had provided the current buyer with exactly the same pre-auction provenance as the prominent auction house had provided at the time of the auction sale. The dealer did not think to second-guess or investigate the completeness of the provenance provided by the auction house and did not have the resources to do so. Previous owners of the work did not want their identities disclosed due to privacy concerns (which is not uncommon), so a more complete provenance was not even feasible. Nevertheless, the buyer claimed that he had been promised a “verifiable provenance” and sought to revoke the sale. The buyer did not contend that the work was not an authentic painting by the famous artist, but merely that it would be hard to re-sell without a complete and verifiable provenance going back to the artist. Although the dispute ultimately was resolved without litigation, this episode starkly highlights the potential risks a seller may be assuming by providing—without qualification—a provenance that he or she has no real reason to doubt.
Jack Flam should know. He is one of the world's top experts in Robert Motherwell and was friends with the artist for years. Robert Motherwell was the youngest of a group of famous American painters that included Jackson Pollock, Mark Rothko and Willem de Kooning, who pioneered a new style of American art known as abstract expressionism. After Robert Motherwell's death, Jack Flam became president of the foundation dedicated to his work, and was assembling a catalogue of all of Motherwell's paintings - what's known as a catalogue raisonne.
The most common art scam is for a scammer to make contact with an artist  and say that they want to buy some if their artwork that they saw online.  To the unwary, hungry artist this is surely great news.  What the scammer wants is for the artist to ship the art to them without paying for it. In reality, what they will be doing is that they will be providing the artist with stolen credit card numbers or with phony checks in order to make the art purchase.

Bob Keerseweer won an art auction on eBay by bidding $135,805 for a Diebenhorn painting. What Bob didn't know was that Rob Walton, the owner of the work, was part of a ring specializing in driving up the price of the auction. The ring posted 50 bids on the same auction that Keerseweer won. Bob also didn't know that the work was a forgery. Walton and his gang were eventually arrested and convicted (Silicon Valley Staff, 2001).

Scientific research is generally held to be of good provenance when it is documented in detail sufficient to allow reproducibility.[28][29] Scientific workflow systems assist scientists and programmers with tracking their data through all transformations, analyses, and interpretations. Data sets are reliable when the process used to create them are reproducible and analyzable for defects.[30] Current initiatives to effectively manage, share, and reuse ecological data are indicative of the increasing importance of data provenance. Examples of these initiatives are National Science Foundation Datanet projects, DataONE and Data Conservancy, as well as the U.S. Global Change Research Program.[31] Some international academic consortia, such as the Research Data Alliance, have specific group to tackle issues of provenance. In that case it is the Research Data Provenance Interest Group.[32]
Sometimes provenance can be as simple as a photograph of the item with its original owner. Simple yet definitive documentation such as that can increase its value by an order of magnitude, but only if the owner was of high renown. Many items that were sold at auction have gone far past their estimates because of a photograph showing that item with a famous person. Some examples include antiques owned by politicians, musicians, artists, actors, etc.[6]
Conservation issues of Pompeii and Herculaneum Conservation-restoration of Ecce Homo by Elías García Martínez Conservation-restoration of The Gross Clinic by Thomas Eakins Conservation-restoration of Leonardo da Vinci's The Last Supper Conservation-restoration of the Shroud of Turin Conservation-restoration of the Sistine Chapel frescoes Conservation-restoration of the Statue of Liberty Conservation-restoration of the H.L. Hunley Modern and Contemporary Art Research Initiative

Forgers of older artworks sometimes attempt to override forensic methods by using or plausibly imitating authentic materials. One of the best-known cases is that of forger Han van Meegeren, who used a modern paint mixture but mimicked an older technique to a sufficient degree that his paintings were certified, as he intended, as originals by the 17th-century Dutch master Johannes Vermeer. Even though further testing can reveal that a paint’s age has been masked, museums and collectors often simply accept initial results.